I Am On My First Night On Klonopin, After Weeks

I am on my first night on klonopin, after weeks of very limited sleep, only sometimes helped by ambien. I took .5 at 11 pm and got no help, so took another .5 at 1 a.m. but 3 hours after that I still feel nothing. What should I think about this? Is it now unlikely Klonopin will work for me tonight? And beyond tonight? Thank you.