Welcome to LD4ll Nemidaelius! 
ADD and insomnia could make it harder for you to practise WILD techniques, cause you have to focus continuously on something… and fall asleep! But I don’t see why it would be a problem with DILD methods (autosuggestion, MILD, etc.)
Some relaxation methods were recently described in this thread. I hope you’ll find what you want:
https://community.ld4all.com/t/many-questions/13959
Good luck and tell us your results! 