Sleep Hygiene
Usually not, but decaf isn't caffeine-free. A typical cup still carries about 2 to 15mg of caffeine, versus 80 to 100mg in regular coffee, so one evening decaf is unlikely to wreck most people's sleep. The catch is dose and sensitivity: two or three decafs after dinner can add up to as much as a small regular coffee, and if you're a slow metabolizer or highly caffeine-sensitive, even small amounts can register overnight.
There's also a behavioral angle worth naming. A warm evening coffee — decaf or not — can become a cue your brain links with being alert and winding up rather than down, and the ritual itself can keep you sitting up later than you meant to. If decaf helps you cut back from regular coffee, it's a genuinely useful step; just treat the late cups with the same caution you'd give the real thing.
The Rest baseline still holds here: caffeine, including the trace amount in decaf, is best finished by 11am, or at least 8 hours before bed, if you know you're sensitive.
Full guide: Caffeine Cutoff: When to Stop for Better Sleep.
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Disclaimer: Rest is a self-management and well-being tool for sleep improvement and is not intended to diagnose, treat, cure, or prevent any disease. It does not replace care by your healthcare provider or any treatments you may be using. Always continue to take your medications as directed by your healthcare provider. The information provided in the Rest app and related materials is intended for your general knowledge only and is not a substitute for professional medical advice or treatment for specific medical conditions. Use Rest only as directed. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding a medical condition. If you have or suspect you have a specific medical condition or disease, please consult your healthcare provider before using the Rest program.
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