Yoga for helping sleep?

Yoga for helping sleep?
yes yoga is great
My mom has gotten me a DVD with around 5 different yoga routines and the one i do is for relaxation and flexibility but it only goes for 10 minutes (but i do a few more stretches after and before) Do you think this would benefit my health at all?

thanks

By the way I'm 14 and i do about 40 minutes walking a day if that helps :)

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