I'm evil. I suggest getting the younger cat his own kitten to play with.

But that probably won't help you sleep too much. You'll just have two cats attacking you.
My youngest cat (now 3 years old) didn't let me sleep through the night until she was about 1.5 - 2 years old. That amazingly happened right around the time we started using an electric blanket in the winter. She loved laying on the warm blanket so much, she slept in. But the time summer rolled around and we no longer needed the extra warmth, she kept sleeping through the night, snuggled up right along side me. Now I have to kick her out of bed so I can get up in the morning.
Also, keep it as dark and quiet as possible in the bedroom. It's getting light earlier now, so kitties wake up to the sun and the birds chirping.
Another option: Don't let the cat in the bedroom. You won't wake up to your feet being pounced. You'll wake up to the clawing and meowing at the door instead.
