Publisher's Weekly Review

Neurologist Barone and former journalist Armour follow up Let's Talk About Sleep with a mostly-solid guide to improving one's sleep. A literal A-to-Z compendium, the authors' survey defines sleep-related issues and includes helpful (and occasionally odd) sleep strategies. The "S" section, for example, digs into "second sleep" (a medieval sleep cycle); whether serotonin plays a role in sleep (it may, based on studies done with zebrafish and mice); sexsomnia (similar to sleepwalking, but for "engag in sexual activity"); keeping a sleep diary (include lights-out time, wake-up time, and how long it takes to fall asleep); and sleep positions (the fetal position is a good option). "M," meanwhile, includes mattress recommendations (firmer is better) and notes on meditation (which can help one sleep better), "P" dispenses tips for finding the best pillow and covers performance anxiety (which insomniacs can develop when it comes to bedtime, "a vicious cycle where it's almost impossible to sleep"), and "O" defines obstructive sleep apnea. Most of the entries are brief overviews or straightforward definitions, and the A-to-Z format can feel a little gimmicky. Those having a tough time sleeping, though, will find these quick entries a fine place to start. (Mar.)