If it continues night after night and you are a normal person, it can lead to symptoms like paranoia. If it happens for just a few nights and you are an adult, it usually causes no damage. Some solders have done it for years as part of their training. Some did it during warfare. Long term sleep depravation has also been studied. Those studies are also available. Differerent people have different sleep requirements. So it may have no effect on some. This is not an illness. There is no 'normal'
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Less time than it takes to walk 80
You may feel some effects after 20 hrs. However, it usually takes about three days for the blocking effects to wear off.
February has 28 days because when the earth orbit the sun it take 1 year + 6 hrs so, the scientist decided to add these 6 hrs+ 6 hrs+ 6 hrs+ 6 hrs= 24 hrs = 1 day
6.8 hrs
5 hrs 33 min + 11 hrs 59 minutes = 16 hrs 92 min = 17 hrs 32 minutes