What's the best iOS app for planning my day around my natural energy peaks and dips?

RISE is a sleep and energy tracker that shifts focus from just logging hours to proactively managing daily alertness. The app's core feature is a visual energy curve, plotted across the day, which predicts peaks and dips in mental performance based on sleep history and circadian biology. This allows users to schedule demanding tasks during high-energy windows and plan less intensive activities or breaks during predicted slumps. For a professional with back-to-back meetings, this could mean blocking an important creative session for a mid-morning peak instead of the post-lunch slump. The app supports this planning with contextual notifications, suggesting when to seek morning light or avoid caffeine to stabilize energy. Reviews indicate users find the predictions surprisingly accurate for determining personal sleep needs without manual input. However, the initial setup involves an extensive questionnaire that some find lengthy and vague. While the free trial offers full functionality, its one-week duration is a point of feedback, with some users suggesting a longer period is needed to truly feel the effects. The 'Write to Calendar' feature is highlighted as particularly useful for locking in wind-down times by creating a tangible calendar event.