Eli5, What is that good tingly feeling you get right before falling asleep?


The only way I can describe it is like a rush of something (like adrenaline) but a more relaxing, warm feeling rather than the spiking, energetic feeling of adrenaline.

In: 6

As your body approaches sleep, your heart rate and blood pressure lower, muscles relax, and your brain chemicals change – an especially important change is that there’s more GABA, a neurotransmitter associated with relaxation. So your comparison to an adrenaline rush is very apt, you’re experiencing an increase in a neurotransmitter that does the opposite of what adrenaline does. 🙂