Free Circadian Rhythm ringtone for your phone. Listen first, then download the version you like. The song is performed by Drake. You can choose from 6 versions between 13 and 26 seconds. Tags: hip-hop, slow and rap. Click a tag below to see more ringtones like this. Two formats are available: .MP3 for Android and other phones and .M4R for iPhone. To see all ringtones by Drake, use the link under the title or look at the related ringtones below.