| Δ0 | the short 20-minute afternoon power nap itself | a 20-minute afternoon power nap |
| Δ1 | other short daytime naps varying in length or timing | a 10-minute catnap, a 30-minute nap, a morning nap, a lunchtime nap, an evening snooze |
| Δ2 | other daytime rest and relaxation practices | an afternoon tea break, a short meditation session, lying down with eyes closed, a quiet reading break |
| Δ3 | broader nighttime sleep-related behaviors | a regular nighttime sleep schedule, sleeping in on weekends, adjusting to jet lag, a consistent bedtime routine |
| Δ4 | general daily health and wellness habits | daily exercise, staying hydrated, eating a balanced diet, morning stretching |
| Δ5 | everyday leisure activities unrelated to rest or health | reading a novel, doing a crossword puzzle, gardening, listening to music |