Tramadol to help you sleep? lol
More like tramadol to help you not sleep.
It will help to pull an allnighter with, as it has NE reuptake properties, 5-HT releasing properties, and opioid properties from the O-Desmethyltramadol. The 5-HT release makes it more relaxing than regular stimulants.
Also, tramadol already releases 5-HT, so I wouldn't use 5-HTP (5-HT precursor), could be dangerous at high doses of tramadol, although you should be alright at 50mg tram.
Opioids are poor choices to use as sleep aids, tramadol doubly so. Opioids are stimulating in nature, due to the indirect release of DA (dopamine), which breaks down in to NE (norepinephrine). They are classified as "CNS depressants," but many find they cause insomnia and stimulation.