Is twitching normal as you fall asleep?

Twitching. Twitching at the time of fall asleep is actually not uncommon.
They can be. Movements around sleep onset are quite common and may be simple as leg twitch or body jerk and a feeling of falling. They can also be a sign of restless legs or periodic limb movements during wake. Most sleep specialists are not concerned unless it is affecting getting to sleep, affecting your sleep quality or are disruptive to a bed partner.