Hello Bryce and happy new year!
I’m sure we can all relate to your situation in many ways. You admitted you slept great when you never thought or cared much about it. And this is the key which really rests on only one word: indifference. If you could forget or at least ignore your insomnia, then it cannot exist. That is the weirdest thing. Basically, you have defined your insomnia into existence inside your mind. You defined insomnia as sleeping anything less than 3, 4 or whatever hours. But insomnia isn’t just numbers or even sleep itself. A more accurate definition of insomnia is the FEAR OF WAKEFULNESS. This makes it more of a phobia than a physical ailment.
The fact is nothing about your body or its sleep ability has changed. It’s your thoughts toward sleep that has. Then what you are really afraid of is just your own set of thoughts.
Instances of short term insomnia are extremely common and it happens in everyone. They’re just conveniently forgotten now when you become too caught up with the perceived effects of insufficient sleep.
The fix is usually quite simple. Do exactly what you did before. Go to bed at X o’clock and out at Y. Get on with your day as usual and don’t dwell on what happened between X and Y until it’s X again. Rinse and repeat. Resist the urge to change anything or do anything to sleep. Because it is those little things you do, which keeps the fear going and your mind will keep thinking there’s this monster called insomnia you need to manage and keep under control every night. This also means avoid trying to relax away stress or anxiety in the hopes you sleep better. It WILL NOT work, the result is usually random because there’s really no connection at all. Your body will recover naturally if you let it. Be okay with wakefulness at any time and any night. In due course, you will become indifferent like all recovered insomniacs ultimately do. Good luck to you.