Most adults need between 7-9 hours of sleep a night. Some may need less, and too much sleep can just make you feel more tired.The National Sleep Foundation has a useful chart on their website for all age groups.http://www.sleepfoundation.org/article/how-sleep-works/how-much-sleep-do-we-really-need
My doctor has told me that tweens need 9 hours of sleep a night! A Sleep Doctor should tell you to sleep 10 hours of sleep not 9 hours. Now Adult can sleep up to 6 hours, there bodys don't need that much sleep:)
at least 8 hours of sleep
Lizards needs 11hrs of sleep
an adult need sleep of maximum 8 hours.
It all depends on how much sleep they themselves need. A study said that a child needs 8hrs minium and 12hrs maxium.
between 5-7 hours of sleep. Children need at least 7-8 hours of sleep
alot
A labrador retriever needs as much sleep as other dogs, 12-14 hours.
The amount of sleep may vary so much, although most of adults get restored after 5 to 8 hours of sleep.
8 or more
How much sleep does a 11 year old need of sleep Optimally, 8-10 hours is what you should be looking at around 11 years of age.