I know you can look at your active effects through the magic menu to tell if you have the rested or well-rested bonus, but I honestly have a hard time tracking how many game hours have passed before I need to get the well-rested bonus again. Am I missing some notification somewhere that tells me I lost my bonus so I know when to rest again without having to track game time or frequently check the magic menu?
There are no notifications as such. You need to check the active effects and see whether you still have the bonus (it lasts for 8 hours). I feel 5% doesn't make much difference unless. 10% is still worthwhile. So whenever I'm near a bed that I own or inside some inn I just spend sometime sleeping.
Level Effect Name Bonus Attained. 1 Rested 5% Sleep in any bed. 2 Well Rested 10% Sleep in a bed you own or rent. 3 Lover's Comfort 15% Sleep in the house where your spouse lives.
You don't have to sleep for long durations. Even 1 hour of sleep is enough to give you the bonus.
Note2: Activating the lover's stone gives you a permanent 15% faster progress in all skills.