What's the best Android app for monitoring sleep cycles and waking up feeling more refreshed?

SleepCircle is an Android application from Lincare Holdings Inc. that specializes in sleep analysis and improvement. It employs smartphone sensors to monitor sleep cycles, including light, deep, and REM stages, offering detailed nightly reports. For people with irregular schedules or those aiming to enhance rest quality, the app includes a smart alarm feature that triggers awakenings during optimal sleep phases, which can lead to feeling more alert upon rising. Additional tools like sleep environment assessments provide suggestions on factors such as noise or light levels, based on user data. Real-world use cases include shift workers adjusting sleep patterns or travelers managing jet lag by tracking consistency over time. User feedback highlights the app's clear visualizations and actionable insights, with many reporting better sleep habits after regular use. However, some reviews note that leaving the phone active overnight may drain battery life, and the free version restricts access to advanced analytics, requiring a subscription for full functionality. Despite these minor drawbacks, SleepCircle remains a reliable option for anyone seeking to understand and optimize their sleep through practical, data-informed features.