If you wake up throughout the night and can't get back to sleep, you could have Restless Leg Syndrome.
Do you constantly need to move your legs? Do you find yourself tapping or shaking when you're sitting, and even kicking in your sleep? You likely have restless leg syndrome, and it could be destroying your sleep, keeping you awake, leading to fatigue the next day.
Often, people's RLS will get increasingly worse as they grow older, making it more and more difficult to deal with. However, because they have always moved their legs in that way, they might not realize that it is a problem that needs to be addressed. Some people will get up and walk around before heading back to bed, but this is only a temporary fix.
To fight against the sleep problems associated with RLS, self-care and alterations to lifestyle like eliminating caffeine from your diet, engaging in physical exercise, quitting smoking, and meditating may be useful. In certain circumstances, medication may be of use.