Can't sleep after I had a nap...

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Since it was raining here in our City in the Philippines, I was early to come home from work and i was kinda tired, so after dinner around 8pm i took a nap but the nap took longer...:( and when i woke up it was already past 12 midnight. Now, i want to just continue with my sleep but now i am so awake! I drink a glass of warm milk to keep some tryptophan in my bloodstream to aid sleeping but i still can't. What do you think are your tips helps me fall asleep?? I need at least 5 hrs of sleep to be able to be effective at work. Please, anyone give me some tips.........