Try Self-Concentration. (I seem to recommend this alot)
Small Universe is fabulous for clearing the Primary Channels, yet the energy running through the neck/head area may stimulate or excite neurons, causing you to be energized, you're body is like "let's go! we don't need sleep!" but you're saying "I should *probably* sleep".
As for Self Concentration, it involves relaxing parts of the body, from the head to the feet and then opening channels and then clearing them, there's also a large quiet part (that has definitely pulled me into slumber many a time--often times, I'd even sleep through the closing--in which case the sub-concious takes over the job and does it for you. )
Try it for a few nights, and see where that leads you.
~Z
