We are fairly new to D&D and we are not really sure about how to handle one thing as provided by the rules. It's about the point in time when you level up in-game.
The rules tell us this:
As your character goes on adventures and overcomes challenges, he or she gains experience, represented by experience points. A character who reaches a specified experience point total advances in capability. This advancement is called gaining a level.
When your character gains a level, his or her class often grants additional features, as detailed in the class description. Some of these features allow you to increase your ability scores, either increasing two scores by 1 each or increasing one score by 2. You can't increase an ability score above 20. In addition, every character's proficiency bonus increases at certain levels.
We understand that if you gain a specific amount of XP you advance to an higher level, but we want to know how this is expressed in game how according to the rules. Does it really happen instantaneously?
We heard from other players that in earlier editions this did happen after a long rest, but we just cannot find any clue about it in the 5e rules.
We could make a homebrew rule for that but mainly we just want to know if we are just too blind to find it. 😅