Sleep—sometimes it’s easy to find and sometimes it eludes us. Most of us are challenged by an occasional sleepless night. But some of us are plagued by not being able to get to sleep, or by waking each night and not being able to fall back to sleep. Before electricity, we didn’t have much choice but to flow with the circadian rhythm. The sun goes down, we go to sleep. The sun comes up and so do we. These days, chemicals, electronics, binge-watching TV, and our emotions can cause us to stay up beyond our physical needs. Ayurveda gives us...