Yes, that happens sometimes, usually when I'm in a great stress or went to sleep extremely late. If it's a rare thing, then don't worry, but if that happens often, it can be one of insomnia symptoms and during time it can be worse too.
From my own experience I can recommend you such natural ways of improving your sleep:
- reduce general amount of caffeine during the day or avoid it at all (especially in the evenings)
- stop eat before your bedtime, fulll stomach creates great tension in your body and makes much worse your whole sleep (your last meal should be not later than 3 hours before your bedtime)
- make physical exercises regurarly (it's very good both for your physical and emotional health, and will help to reduce your stress before the bedtime)
- use special relaxing techniques during the day (there are a plenty of them now, in my case the most helpful was a simple meditation)
Also doctors recommend to check your hormones
www.hgha.com/hgh-deficiency-diagnosis and body in general for other possible illnesses which can be connected with bad sleep too. For example, lack of HGH (human growth hormone), low testosterone etc. often cause insomnia, anxiety and depression.