How many hours of sleep were you getting per night?
If I go to bed early, consistently, then I only need about 7 solid hours of sleep - not 8 or 9. It's different for everybody. You need to find out 2 things to begin:
1. When your sleep window is
2. How many hours of sleep you require if you hit your sleep window
"Sleep window" is simply the term for that time when you get tired at night. For me, that's around 8:30pm. Really it's maybe 20 minutes where I get drowsy...like between 8:20 to 8:40pm. I'm usually on the computer or watching TV, my eyes start to droop, but I ward it off and get my second wind. If you can go to sleep during your sleep window, it makes it a LOT easier to fall asleep, stay asleep, and feel well-rested when you wake up.
The difficulty is that you can't begin your bedtime routine during your sleep window, because then you'll miss it. You need to brush your teeth, get into your jammies, plug in your phone, and then hop into bed. One other trick I learned from my doctor is to not use any flickering screens an hour before bed (TV, computer, mobile device, etc.). So unplug at 7:00pm, do my bedtime routine (dishes, cleanup, brush teeth, etc.), then hop in bed at like 7:45pm. I can usually fall asleep within 15 minutes if I haven't doped myself up with a sugary dessert or done a workout within a couple of hours of bed. Everyone's different...some people need like a protein snack before bed to sleep well. Just have to find out what works for you.
So to start out with, start tracking that time when you get tired. It's usually pretty consistent. For me, it's like 8:30pm or around 2:00am. I usually go to bed at 11:00pm out of habit & feel semi-crummy when I wake up. I wake up groggy instead of energetic. If I fall asleep within my sleep window, I wake up feeling awesome. Diet has a lot to do with it too...I get acid reflux, so I can't eat stuff, especially acidic stuff, within a few hours of bed. Exercising at night also pumps me up & wakes me up, so I try to do it in the morning.
It took me a long time to figure out how to sleep properly. I had really bad insomnia for a long time...couldn't fall asleep, couldn't stay asleep, never felt well-rested, always tired. For whatever reason, going to bed earlier makes me feel better. I don't know how that translates out with daylight savings time or anything, I just adjust with the time change.
After you find your sleep window, start going to bed during it for a week or two. If you don't have to wake up for school or work or kids in the morning, let yourself sleep in for a few days and catch up/normalize on sleep, and then start seeing what time you naturally wake up. I wake up around 3:30 to 4:00am when I fall asleep at 8:30pm, no alarm clock required. The interesting thing is that I don't feel groggy and actually feel motivated & energetic. I don't know why it has such a strong effect, but the combination of hitting my sleep window & getting the natural number of hours my body needs makes me feel ridiculously awesome. Better than exercising, better than eating clean. Of course, that's the holy trifecta of health - eat well, sleep well, exercise. Then you turn into one of those over-motivated nuts who runs around happy all the time
In a nutshell, sleep is a lot more complicated than most people think. And everybody is different. Some really driven people only need 4 to 6 hours of sleep. After about 3 days, I'm a useless mess if I deprive myself like that. Even if I go to bed at midnight and get like 8 hours of sleep, it's just not nearly as good as going to bed early and only getting 7 hours of sleep. I don't know why; that's just how it is for me. And I wish I was better at it...I stay up late alllllll the time haha.
Anyway, if you want to get more stuff done, then figure out what your body's requirements are: when it wants to go to bed (your sleep window) and how many hours of sleep you require when you listen to your body and go to sleep at that time. It will really take two or three weeks to adjust because it's a huge change for your body's clock and your habits, but once you get in the groove, it's awesome. Listening to your body is just a hard thing to do sometimes though, but at least if you spend some time figuring out what your body needs, you'll be ahead of the game.