Most people think of bedtime as the safest and most peaceful part of the day.

You lie down, close your eyes, and allow your body to recover from everything you’ve experienced.

But what happens when someone goes to sleep after drinking alcohol, taking certain medications, or using other substances?

Health professionals warn that some substances can interfere with the body’s natural sleep processes, even when they initially make a person feel relaxed or sleepy.

What seems like a harmless way to fall asleep faster may actually affect the quality of rest.

Some people wake up feeling exhausted, confused, or unable to concentrate, despite spending several hours in bed.

Others may experience more serious complications, particularly when alcohol is combined with certain medications.

And the danger isn’t always obvious before someone falls asleep.

One particular combination can interfere with normal breathing during sleep — and understanding the risks could help prevent a medical emergency.

Continue below in Part 2