Impossible to sleep - Alarm clock free is a free Android app developed by Mauter. This app is perfect for those who have difficulty waking up in the morning. It offers several functions to make sure you wake up on time and start your day.

One of the unique features of this app is the ability to stop the alarm by measuring your heart rate. You must move to increase your heart rate and only then will the alarm stop. Another option is to solve math equations or sort numbers to turn off the alarm. You can also play a memory game to find the same colors or shake your smartphone to stop the alarm.

In addition to these features, you can also turn on the flashlight when the alarm clock starts, snooze to postpone the alarm clock, and set an unlimited number of alarm clocks. You can choose between ringing, vibration, or both, and brightness and volume increase smoothly.

If the alarms don't ring at the correct setup times, you may need to add this app to your smartphone's whitelist to ensure it works correctly.

Overall, Impossible to sleep - Alarm clock free is a must-have app for anyone who struggles with waking up on time and needs a little extra motivation to start their day.