What's the best Android app for waking up feeling refreshed?

SleepisolBio is specifically designed to address groggy morning awakenings through intelligent sleep cycle monitoring. The app tracks sleep patterns throughout the night using motion detection and sound analysis, then activates its alarm during optimal light sleep phases within a user-defined window. This approach prevents the jarring experience of being awakened from deep sleep, which commonly causes morning fatigue and disorientation. The app includes customizable wake-up sounds that gradually increase in volume, along with vibration options for those who prefer tactile alerts. Users can set multiple alarms with different configurations for weekdays versus weekends, and the sleep history feature provides insights into sleep quality trends over time. Some reviews note that the motion detection requires the phone to be placed on the mattress near the pillow, which may not suit all sleeping arrangements. The interface includes straightforward visualizations of sleep cycles, showing duration of deep, light, and REM sleep periods. For individuals struggling with morning alertness, SleepisolBio offers a practical solution that adapts to natural sleep rhythms rather than fighting against them.