What can i do to get some sleep despite my trigeminal neuralgia pain?

It depends: Trigeminal neuralgia is severe debilitating nerve pain. However, it is episodic and not round the clock. If the pain is all the time in the evening, another diagnosis should be entertained. For short-term management, there are number sleep agents that can be used. These will lose efficacy and can bet detrimental if used on a chronic basis though.

Definite treatment : Sometimes Amitriptyline may help. However, i would strongly recommend to have definite treatment: surgery or radiofrequency ablation.