I have experienced this as well. I'm currently 23 years old and I suddenly easily get bored while playing even a genre of my liking which is an RPG. Can't even play 8 hours straight or past bed time anymore. But then I realized it wasn't because I was growing up or I'm starting to be uninterested on video games but simply because the game I'm playing is quite bland despite of the awesome graphics compare to the previous games.
Then one day, after I played Catherine(an Atlus game), I got addicted again my gaming aura came back! Then I played Nino Kuni and I got bored easily again(Although I still managed to platinum) it. You could try playing mobile games for now like when I started playing Game of Dice and it got me going again! It's a casual game so I think it will fit your schedule.
I then started thinking what games I can play past bed time or longer hours. And these are awesome games made by Atlus, Capcom, Square-enix, and Bandai. Although during the age of PS3, a lot of RPGs even with those developers aren't that addicting anymore compare to the old games. But there still a few rpgs that I really like on PS3 which get me really going like FFXIII part 1-3, Catherine, God of War etc. DMC reboot(due to a change in developer) and Tales of Zeristria(due to its bland story and characters) diminishes my interest again, its the only DMC I didn't managed to platinum.
So yeah maybe you should trying playing really addicting games that are just as enjoying as the previous games. Don't worry I feel like PS4 is the return of awesome JRPGs like FFXV, Dragon Quest Heroes, Kingdom Hearts 3, Star Ocean 5, Tales of Berseria, etc. :D
