Yes, decaf coffee can affect sleep or anxiety in some people, because decaf is not caffeine-free. The FDA says an 8-ounce cup typically contains 2–15 mg of caffeine. That is far less than a regular cup, but the amount varies by product and so does individual sensitivity.
Why decaf can still have an effect
Decaffeination removes most, not all, of coffee’s caffeine. The FDA says decaffeinated coffee still contains some caffeine and gives a typical range of 2–15 mg per 8-fluid-ounce cup. It also notes that people differ in how strongly they respond to caffeine and how quickly they eliminate it. People who react strongly may want to avoid decaf as well as regular coffee. FDA guidance on caffeine.
The range is a general guide, not a guarantee for every cup. Serving size and product affect how much caffeine you consume. A 2006 analysis found variation in a limited set of decaf drinks, but those historical measurements should not be treated as current values for any brand. The 2006 caffeine measurement study.
Does decaf coffee keep you awake?
The available direct comparisons suggest decaf is less disruptive to sleep than caffeinated coffee in the studied settings, but they do not establish that decaf never affects anyone’s sleep.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Evening coffee trial
In a 2012 double-blind crossover trial, 63 healthy adults who considered themselves caffeine-sensitive drank after-dinner coffee containing either 90 mg of caffeine or 4.5 mg in the decaf condition. Participants reported worse sleep quality, longer time to fall asleep and more awakenings after the caffeinated coffee than after decaf. This was a comparison of those specific drinks in a selected group, not proof that every person can drink decaf at night without an effect. The evening crossover trial.
Sleep laboratory study
A small 1979 laboratory study followed 18 young adult men over 13 nights. Regular coffee affected measured sleep parameters in a dose-related way, while a four-cup equivalent of decaf had no measured effect in that study. Its small, narrow sample limits how broadly the result can be applied. The sleep laboratory study.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Broader caffeine research gives context, but it is not a direct estimate of decaf’s effects. A 2017 systematic review found that caffeine typically increased the time needed to fall asleep, reduced total sleep time and sleep efficiency, and worsened perceived sleep quality. Effects varied with dose and timing, and between individuals. Most included studies involved Western adult men. The systematic review.
Can decaf make you feel anxious?
Evidence specifically about decaf and anxiety is limited. In a 2017 randomized, double-blind study of 49 healthy adults aged 18–45, the caffeinated treatment produced significant direct effects in anxiety and stress-related quality-of-life domains; the decaf group had no significant changes in the measured outcomes. The study’s small sample and healthy volunteers do not establish how decaf affects people with anxiety disorders or especially high caffeine sensitivity. A lack of significant changes in this group is not proof that residual caffeine cannot affect an individual. The mood, sleep and quality-of-life study.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
What to consider if decaf seems to affect you
Switching from regular coffee to decaf usually lowers caffeine exposure, but it does not ensure zero caffeine or zero symptoms. If you notice a possible connection, consider the size of your serving, when you drink it, other caffeine sources you consume and whether you tend to be sensitive to caffeine. Compare the caffeine amount per serving when it is disclosed, rather than assuming all decaf cups contain the same amount.
If a health condition, medication, pregnancy or breastfeeding raises concerns about caffeine, the FDA advises discussing caffeine limits with a health care provider. Do not assume that decaf will resolve insomnia or anxiety; persistent or concerning symptoms warrant appropriate medical advice. FDA guidance on caffeine.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
