It's really hard to wake people up in deep sleep, which becomes an emergency when your spouse picks up the car keys and starts backing the car out of the garage without activating the garage door. Even as a child I hated waking up early in the morning. Something about being startled out of a deep sleep by a clanging alarm made me feel disoriented and lonely. ... and the sleep is fairly light. During deep sleep, the body restores various functions, including energy and memory. People may wake up from this stage of sleep …