why do we sleep lying down?
348837
I think it would be cool to sleep in water, if there was no way to drown.  Weightless and cushy, eh?
490073
sleep  more  at   night.
867454
Its not needed. Its probably just a custom to sleep when its dark.
433679
When you fall asleep, you fall over.
629002
Your body is telling you it wants more sleep...listen to it.
221264
The record is something like 12 days or so by a kid. Everyone will eventually succumb to the need to sleep but when in the question. They cannot figure out why our body needs sleep and one one has ever died from a lack of it. Some theorize that we sleep because back in the day humans needed to stay in at night to avoid getting killed by nocturnal animals.
452394
because just because your physical body needs rest, your brain can't just "die".  It's constantly doing something....so your subconscious just takes over for you when you sleep.  Takes you into another place
695849
How do you sleep at night?
1042476
The body redirects blood circulation to the stomach for digestion purposes after a meal..It IS  beneficial to lay down after a meal so that digestion works better.In fact if you look at animals in the wild they usually lay down roll on their backs and sleep for a few hours after a meal .Maybe they know something we don't. The only thing I can think of that may be a problem laying down after a meal is people with acid reflux disease, but even then a person could lay down propped up on pillows. Do what your body tells you to do not what society wants
1093765
You need to go lie down for a bit.
1106128
well, because when we sleep we have no control of our thoughts.\nIt's just  jumbled up pieces of our memory made into an interesting story.
205513
The main variation comes from the gel discs that are lodged between your vertebrae. When you are lying down, they expand more. So for a short period of time in the morning you are taller than when you went to bed. It is usually a very small amount though.
575198
When you lie down, Mean Arterial Pressure increases. This is because when you lie down flat, blood tends to flow easily to the heart. Therefore more blood returns to the heart. And then this causes the heart muscle fibres to stretch, causing it to contract harder (frank- starling mechanism).\n\nHowever in the upright position, due to an action of gravity, it is harder for blood to work against gravity and return to the heart. So lesser venous return, decreased contractility and lower sys di blood pressure.
190913
If you sleep on your side, you should keep you knees bent at a 90 degree angle with a pillow in between them. This helps keep your body aligned. Also a pillow under your head as well.
179767
Yes. When you sleep, its kinda like recharging the battery in your car. If its low, then nothing really works right. This includes your immune system.
64411
when we sleep our brains dont shut down but slow down.  we rejuvinate our brain causing us to think more clearly and be more preductive in just about everything we do.  It can effect the body in the long run.  Our muscles dont get the proper rest they require.  here are two links.  the first goes into great detail about what it does to the brain and the second is sleep deprivation fron diccovery.com
222803
You haven't installed an on/off switch on your back.  Only on your stomach.  Maybe it's better that way since your comfortable both ways.  One way is to resolve things and the other to sleep on them.