This is a list of some things you could do in order to feel those simple joys in life.
During the days in which you don’t have to wake up early, set your alarm clock early so when it rings, you get that wonderful satisfaction of turning it off and realizing you don’t have to get up.
When you’re outside and really thirsty but you’re about to go home; don’t buy water or any drink along the way. Wait until you’re home and drink the coldest glass of water. You save money and you get the most satisfying drink of water ever.
You’re extremely tired from a long day. Go ahead and raise your feet on a stack of pillows and read a book with relaxing instrumental music before getting your feet wet. That way, you avoid varicose veins from your legs and you become relaxed.
Always try not to be the last one to text in conversations with the guy you like so you’ll see him with a follow up text and you’ll find out he likes you an you play the hard-to-get card.
You might want to read, Top 5 Reasons Why You Should Stay Single for at Least a Year After College Graduation
Put a mini disco night lamp and put it in your room, turn on your mini speakers and dance in front of the mirror. An awesome way to unwind if you’re not the relaxing type.
When you have to finish something at night and you’re really sleepy, try to stretch it out and really finish what you’re doing. Sleeping would then be much more fulfilling.
Recall and watch again your old favorite childhood movies with your family or your special someone. I'm referring to the movies you watched when you were really just a kid. Wait for the nostalgia to kick in. 
Re-read old conversations. It doesn't have to be from a lover. You can re-read old conversations you had with someone in facebook or texts and just give yourself a trip back down to memory lane. You’ll find yourself smiling and you are reminded of the bond you share with that someone.
I hope you could also practice these mini life hacks and feel the joy it brings to you!