99% of sleep issues are due to using stimulants too close to bed time. The half life of caffeine is about 6 hours. If you take a pre-workout supplement around 5PM after work and plan to go to bed around 11PM, the pre-workout will still be in your bloodstream in almost full concentrations. If you are using a stimulant based pre-workout before your workouts, either stop taking it or switch to a stimulant free pre-workout.
If that doesn't work - try using a multi-ingredient natural sleep aid supplement that isn't loaded with melatonin so you won't feel groggy the next morning. A lot of sleep aid supplements have melatonin dosages of 5-10mg. The effective dosage of melatonin is 1-2mg. Look for a sleep aid supplement that also contains 5-htp, gaba and magnesium. The product N2sleep from needtobuildmuscle.com is really good.