Sleeping is, perhaps, the most under-rated and poorly understood of our activities. And yet it is probably the most important to us.
If you have any doubt, read the book "Why we sleep - the new science of sleep and dreams" by Prof Matthew Walker. It will shock and amaze you and could - and probably should - change your life. Indeed, it could even save your life! It is a very readable and compelling summary of all the research, facts and theories behind sleep and what it, or its lack, does to us. And written by a neuroscientist it has the badge of authority.
There are loads of myths that need busting and lots to learn. We need a minimum of 7.5 hours a night, meaning we need to aim for 8hrs. Anyone who says they get by with less is either harming or misleading themselves. You cannot make up for lost sleep. Drowsy driving is responsible for more road deaths than drink-driving. Insufficient sleep impairs the immune system and pretty well every biological pathway and makes you tired, lack concentration and energy, unhappy, unhealthy (possibly more so than smoking and alcohol), perform poorly at work, have headaches, dizziness, depression, associated with diseases such as dementia, diabetes, cardiovascular disease, obesity and can contribute to premature death.
The book includes strategies to improve poor sleep habits without resorting to medication (which are not the answer at all).
The NHS.UK pages on sleep, insomnia and tips on how to combat this common problem are very helpful.
Try Beditation - yoga for sleep
Here is a sleep diary which can be useful to help identify the problem.