In Brief: Your Guide To Healthy Sleep

increases during sleep helps the immune system fight various infections. This might explain why a good ... only by 1–2 hours per day at best. Therefore, it can take several days to adjust to a new time zone (or ... of caffeine in coffee, colas, certain teas, and choco-late can take as long as 8 hours to wear off fully. Nicotine is also a ... ................
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