As somebody who usually sleeps well, I'd love to have a dumb app that notes when the last time I put my phone down and the first time I pick it up in the mornin

As somebody who usually sleeps well, I'd love to have a dumb app that notes when the last time I put my phone down and the first time I pick it up in the morning. Maybe with an option to tell it how long I think it took to fall asleep. Does something like this exist?