We need 7-9 hours of sleep. There is a global experiment which is naturally performed on 1.6 billion people in 70 countries every year when day light saving time kicks in. Day after they lose an hr of sleep there is 24% increase in relative heart attack rate...
.. as compared to when in autumn there is 21% reduction in heart rate when they gain an hour of sleep. A very interesting study has found that on the day after daylight savings the harshness of punishment increases by the judges because lack of sleep effects their mood.
Deep sleep is the best health insurance policy you can ever wish for. We all know that during deep sleep we get benefits for our cardio vascular system and it can recharge our immune system.
Many of us love to have one peg of whiskey or alcohol in the evening. How bad is that? I would love to say there is none but there is scientific evidences that it effects our sleep measurably. Alcohol is not a sleep aid. It’s the most harmful for ur sleep. We feel we are getting
.sleep but actually we are getting into sedation. U r not going into natural sleep. Ur sleep will be fragmented. U can never feel alert next day. Alcohol triggers u into an activated state of nervous system. It will disturb your REM sleep. Your liver and kidney will work overtime
I drink very few times in a year. Yesterday was one such night. Two shots and if u see I had zero second of deep sleep. Usually I have 2-3 hours deep sleep every night. Despite 7+ hours of sleep, I had no REM sleep. My HR which usually goes to 45 or so never went below 70. 
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