Sleeping straight through the night without waking once is an impressive feat for anyone over the age of 25, and it seems like the older you get, the more likely you are to experience a random awakening during the quietest hours of the night.

However, you might notice that those random awakenings aren’t so random after all. Perhaps you’ll wake up one morning at 4 a.m. for no particular reason, and then it happens again the next night at the same exact time.

There must be some reason why your body is trying to awaken you during the middle of your rest, but why does it always happen at the same time?

It’s important to get a full night’s sleep for your health, but it can be nearly impossible to return to a restful slumber after you’ve awoken during the night.

One theory suggests your body is waking you at specific times during the night because they correlate to something wrong happening within your body. Your body isn’t static when asleep.

It undergoes a number of activities that help regulate and maintain functionality.

Waking up at the same time every night is thought to be a signal that a specific organ is experiencing problems.

For instance, if you wake up between 9 p.m. and 11 p.m., there’s a good chance you are experiencing thyroid problems. Waking between 1 a.m. and 3 a.m. translates to problems with the liver, and waking between 3 a.m. to 5 a.m. is indicative of lung issues.