Sleep - Run Hard, Rest Well.

I highly recommend Brenda Jank and Run Hard, Rest Well.  Brenda comes from a deep reservoir of life experiences (translate that "challenges") that makes her message real and she freely shares that in a helpful, practical way. Her faith in Christ is clearly the source of her strength.

I've recently been through one of her workshops (I highly recommend it for your church/school staff) and she can also serve as a strong resource on better sleep.