For the study, students were given a series of alcoholic drinks of varying strengths an hour and 40 minutes before going to bed. Each time readings were taken that recorded activity in their heart and brain, Daily Express reported. Researchers found that alcohol resulted insleeplessness and the disturbed nights left the students exhausted.
The alcohol suppressed parasympathetic nerve activity - the part of the "autonomic", or non-voluntary, nervous system that slows heart rate and aids digestion, it was found.
The findings were published Tuesday in the journal Alcoholism: Clinical & Experimental Research .
Study leader Yohei Sagawa, of Akita University, Japan, said: "Although the first half of sleep after alcohol looks good, drinking leads to insomnia rather than good sleep." read more
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