What Nidra Can Do For You
The only advice Tim gave me regarding teaching was, if I recall, "Short naps really help."

Pinched from somewhere or another on the World Wide Web:

During sleep, the body goes through its most significant regenerative processes, which include the production of growth hormone (GH). GH stimulates rebuilding of muscle, improves the delivery of fuel to muscle and stimulates fat metabolism.

Taking a brief nap during the day can provide additional GH release, potentially improving recovery. The duration of a nap need not exceed 20-30 minutes to be effective.

Sleep also supports proper mental functioning such as memory and other important tasks required for optimal performance.

To summarize: take frequent naps!