Does creatine affect your sleep?
Creatine may improve how you experience your sleep, but objective measurements show no effect. The research is based on dozens of participants and the results are contradictory; do not use it as a sleep aid.
Creatine may affect your sleep a little, but the evidence is too limited to recommend it for that purpose. There are only two small studies, and their results contradict each other.
In the first study, 14 men took 20 grams of creatine per day for one week. Afterwards they rated their sleep better on a questionnaire and went to bed earlier. However, a wrist sensor detected no difference whatsoever in time to fall asleep, sleep efficiency, or total sleep time. What you feel and what a device measures therefore diverged.
The second study followed 21 women who took 5 grams of creatine per day alongside strength training for six weeks. On training days they slept significantly longer than the placebo group. On rest days there was no difference, and the overall sleep quality scale did not change. This looks at most like a recovery effect after exertion, not a broad sleep benefit.
There are indications that creatine partly compensates for cognitive decline during sleep deprivation. Creatine acts as a rapid energy reserve in the brain, and that may be useful when you are sleep-deprived. A review article describes those findings as promising, but also preliminary and inconsistent. If you want to try it for this purpose: it involves creatine monohydrate, listed on the label as 'creatine monohydrate', available as powder or capsules, 20 grams per day for 5 to 7 days before the period of stress. More expensive forms of creatine such as HCl or citrate offer no proven advantage. If you are already taking it for sport, you need not expect poorer sleep; take it for athletic performance, not as a sleep aid.
All findings come from two small studies (14 and 21 participants) and one review article. None of the studies is large enough to support firm conclusions. The fact that objective measurements did not align with subjective improvements makes interpretation particularly difficult.
How does stress affect your sleep and recovery?
Stress disrupts sleep, and poor sleep in turn amplifies stress. Research shows the relationship also runs in reverse: people who sleep better experience less stress.
What does alcohol do to your sleep?
Alcohol helps you fall asleep faster, but measurably disrupts the rest of your night, even with just two drinks. If you want to sleep better, drinking less or no alcohol before bed is the most effective step.
Chronic sleep deprivation: how harmful is it for weight and hormones?
Chronic sleep deprivation worsens the body's ability to handle blood sugar, increases food intake and leads to measurable weight gain in as little as six weeks. Seven to nine hours of sleep per night is the best protection.
Does taking glycine help you sleep better?
Glycine shows tentatively positive signals, but the evidence is thin and the only direct human study comes from the manufacturer itself. Anyone who wants to try it would be wise to view it as a complement to good sleep habits, not a replacement.
Does creatine affect dopamine levels?
In healthy people, creatine has no demonstrable effect on dopamine in the blood. Positive signals so far come exclusively from animal studies.
Does creatine also help with memory and concentration?
Creatine can improve your memory, but mainly if you are older, vegetarian, or your brain is under pressure. If you are a young, healthy meat eater who sleeps well, the effect is small to negligible.