Moment before I fall asleep

I realized that at the moment when I’m about to fall asleep my mental symptoms begin to disappear and at times even have a short feeling of what seems to be libido again. This moment only lasts a second or two but it is definitely noticeable.

Does anybody else have this experience? Also, does anybody know why this happens? Could it be an issue with GABA or GABA receptors? I took a GABA supplement but did not notice any effects.

Thanks