Sleep is a necessity that unfortunately, we take for granted. For some of us, hitting the sack comes naturally with a perfectly-tuned body clock. Others aren’t quite as lucky, with insomnia preventing their bodies from getting the recommended seven to nine hours of rest every night.

The effects of sleep deprivation can manifest in many ways. Besides the obvious sensations of fatigue and irritability, a lack of sleep can also result in weight gain, mood swings, and an increased risk of heart disease.

To help your body settle into a regular sleeping pattern, we’ve compiled a list of six apps you can download to monitor your sleep. After all, we spend at least a third of our allotted 24 hours with our heads on a pillow. Don’t you want to find out what goes on once your eyes close?

(Featured image: Chris Clinton/Getty Images, Hero image: Sleep Cycle)