“Insomnia phobia” is a phrase I use to describe the fear of not being able to fall asleep.
Fear has an alerting effect and wakes you up! Telling yourself, “don’t worry about it!”, won’t help if you don’t have the confidence that you will get enough sleep. Cognitive therapy can help. Having a sleeping pill nearby to take if needed is also a way to help eliminate the fear. Even if you don’t use the medication, it allays anxiety, allowing you to lightly focus on something else as you drift off.