Power naps
Short naps of around 20 minutes are a common recommendation because they are long enough to feel rested but short enough to avoid waking up groggy from deep sleep. Start the timer, turn the volume up, and let the alarm end the nap for you.
Twenty minutes fits a full short workout: a warm-up, a few sets and a cool-down.
Twenty minutes fits a full short workout: a warm-up, a few sets and a cool-down. Put the countdown on a TV or laptop in fullscreen so you can see it from the floor or the mat.
Cooking
Many baking and simmering steps sit around twenty minutes. Leave the tab open on a phone or tablet in the kitchen and the alarm will call you back.