The nap should be short, e.g. 30 min max.
Im asking because I cant fall asleep in 30minutes
If it takes you longer than 15 minutes to fall asleep, you might need to look at cutting caffeine or other stimulants out of your diet completely. Exercise will also help.
Usually helps if you're feeling a strong sleep inertia signal (i.e. desire to sleep) compared to just feeling fatigued.
That wont work unfortunately, I am prescribed some. However I had issues falling asleep before the prescription as well