i have just (last night) started using using a sleep tracking app on an android phone.
(for insomnia issues.)
I'm not sure what it is called - my nephew installed it for me & has lent me the phone.
it (the sleep tracker) has a free 14 day trial then is extremely cheap to buy,about £2 in english money.
it gives you graphs of your sleep cycles etc.
am looking for support with it for interpreting graphs etc, from others using it.
am also having difficulty navigating around the sleep traker as i'm not used to smart phones so would appreciate advice with that.