Hey i just wanted to know if it is very important to sleep much and if it is how much should i sleep?
I shoot for at least 8 hours, lately I've been getting 9. To grow one must rest.
Yes! If you do not sleep at least 7hrs, it will hurt you. It's shown in studies that sleep helps with metabolism, and lack of proper length of sleep leads to weight gain.
Yes. It is very important.
Sleep is extremely important. Sleep deprivation affects your body and brain in a number of negative ways, and being completely deprived of sleep will eventually lead to death.
In general 8 hours of sleep is advised for adults, but of course everyone is different. Some people need 7 hours while others need 9. Children need a lot more sleep since their bodies and brains are developing at a much faster pace. Elderly people need less sleep since their brains are not developing that much anymore (with that said, it's completely possible to keep your brain working and developing even at a very high age, it does not start deteriorating until you stop challenging it).
Apart from the obvious like your body being in rest and so on, sleep is also important to your endocrine system and your brain's normal functions. There is for example evidence showing that sleep deprivation messes with your hormones in ways that will make it harder for you to lose fat because it throws off your metabolism. The most important aspect of sleep for the brain is that while you are sleeping, your body "flushes" out toxins from your brain.
Your sleep moves through 90 minute cycles of deep sleep, REM sleep and so on. How you feel when you wake up actually has a lot to do with when in your sleep cycle your wakened. Maybe you've experienced that you can feel well rested after just five hours of sleep and really tired after eight.
If you don't sleep enough, you build a sleep debt that you will have to even out sooner or later. This is one reason why people feel the need to sleep in on the weekends: they have a debt from not sleeping enough during the week. Unfortunately it doesn't work the other way around, you can't save up or reserve sleep to use it later.
An interesting study where the subjects lived under stone age-like conditions for some time showed that they went to bed earlier and slept for longer than in their normal life. All of the test subjects thought that they got enough sleep in their normal life.
Try a sleep tracker like SleepBot. It will give you an idea of how much you sleep and hopefully you'll also learn how to get more and better sleep.
We all can tell you HOW important it is, but not how LONG you have to sleep. As said before, everyone is different. How long do you sleep in general? Do you feel relaxed and full of energy when you get up, or do you still feel tired and sleepy?
Beside the hours you sleep, it's also important how deep your sleep is. Some just sleep 5-6 hours (like I do) but sleep very well, while other sleep 9 hours, but don't be in deep sleep often/long.
A tracker, like Anna suggested, is a good thing to find out. The best is, to find out by trying. If you are tired when you wake up, set the alarm 15min later or even earlier. Sounds strange, to get up earlier to be fitter? Yes, but it's true. If you wake up, while being in deep sleep, you feel tired. If you now get up a few minutes earlier, before you are in deep sleep again, you feel more relaxed.