What I did years ago was found a budget/lifestyle I was comfortable with (including putting some money in savings each paycheck). Whenever I got an increase, I allotted most of it to savings and continued to live comfortably. I'd usually determine some kind of rounded number and if there was extra, then I had that "extra" as spending money. My paycheck is direct deposited, so I setup an automatic transfer to my savings, then when I log the deposit in my checking account ledger, I only record the paycheck minus the transfer amount (I do make a notation about the transfer amount though).
This strategy benefited me in many ways. First, by accumulating a savings account - if there was any unexpected expense, or a fun opportunity, it was easier and less stressful to handle the situation due to having enough to cover whatever it was. The second was when the economy took it's downward slide - I was fortunate enough to keep my job, but everyone was taking mandatory pay cuts. The only impact my pay cut had on me was I was just saving less money (I started doing this years ago). That was when my eyes were really opened up to the good choice I made to save my pay increases.
One thing to note - before I started this savings strategy, when I had credit card debt - the first thing I did was put raises mostly toward the card debt (I still did put some into a savings account, but just a small amount). I really didn't start the savings strategy until that debt was gone. Reason is the interest you accumulate in savings is not nearly great enough to offset the amount you lose in paying the interest on credit card balances. Faster you pay off the principle on those, the better.
So depending on your situation - if you have credit card debt - you may want to put some of that money there first to pay down the debt, then go to a savings strategy. If you don't have debt - strongly consider a savings strategy if you are comfortable with the budget you are living on.
Good luck with your decision - and congrats on the pay increase!