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Sometimes I sleep at 11, other times at 2 and 3 or 4. As a result my waking time also keeps varying everyday. Is there any decline in the productivity of a person with these kind of habits?

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Such erratic sleep patterns can be harmful. Is there any particular reason for such varied sleep hours? –  eminemence Jun 26 '12 at 7:23
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@eminemence I don't have a fixed schedule of work everyday, sometimes my classes start at 8 other times at 11. I exploit these ending up in different sleeping patterns –  nischayn22 Jun 26 '12 at 8:46
    
Your body always tries to get into a routine, when you break it, it costs energy to adapt. It's energy you can't use the concentrate to focus. –  Demian Kasier Jul 13 '12 at 23:15

3 Answers 3

Sleep is basically the time the brain relaxes and your thoughts for the day are reviewed. It gets your brain ready for the next day.

Some suggestions to follow are :

Sleep at the same time everyday.

Avoid exciting stuff like games or tv just before sleeping. It will keep you more awake. Avoid energy drinks late in the evening, it will only disturb your routine.

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Is there really evidence that sleeping less than 8 hours some days is likely to lead to ADD? Could you include a link? This sounds pretty surprising, and would probably cause a lot of people to change their sleep habits if it was widely known. –  weronika Jul 1 '12 at 3:17
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I've never heard anything to back this up, so I'd like to see a source as well! –  scientifics Jul 6 '12 at 17:38
    
I'd like to second the comments above. –  Jeel Shah Jul 6 '12 at 18:00
    
Here is the link which lists the side effects of sleep deprivation. en.wikipedia.org/wiki/Sleep_deprivation. My answer wrongly suggests that sleeping less than a particular number of hours (8 in this case), will cause ADD. –  eminemence Jul 12 '12 at 12:53

I have no proof of this other than personal experience, but I find I am much more productive when I follow a regular sleep schedule. After following one for a few weeks, you will find your body telling you when to go to sleep and when to wake up.

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Sleeping at different times each night interrupts your circadian rhythm. Take jetlag for example. Granted, staying up till 2 AM instead of 11PM won't give you jetlag symptoms, but it may cause you to be sleepy throughout the day (personal experience). I think the biggest problem you will face with a random sleep schedule is fatigue on the days in which you stayed up late the night before; which can be a mood and motivation killer.

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