You were right that it takes time to make a habit fully ingrained. You said 90 days. For me, it appears to have taken 112 days. Hooray. It happened.
P.S: Tonight, after a long day with not enough sleep and a house full of kids, I went to bed unexpectedly early--which means, I put the little one to sleep and fell asleep myself. We started the process at 7:00, with hopes that an early bedtime would leave me some practice time. She had other plans. We read, we told stories, she cried, I pulled a pillow over my head. Finally, at 9:00 pm, I told her for the 40th time that it is time to stop talking and now we're going to sleep. Then I fell asleep. She did too.
I slept fitfully til 12:30 am, waking frequently, listening to the windy deluge outside and, each time, putting myself back to sleep by reciting scale patterns to myself in the key of C# minor. (I recognize what this says about my sanity.) Turns out, though, that mental scale study is a sedative, though not a permanent one. I did fall asleep, but then woke up again. Ten times. Finally, I gave up, went downstairs, and watched U2 and the Just Kidding lady on Saturday Night Live. I gave up on the TV after a skit that wasn't funny at all, and returned to bed again. No sleep this time. I hadn't even picked up my instrument all day, and that may be the first time since July that that's happened.
It began to look like I'd never sleep til I practiced a bit. At 1:30ish, I made my way to the music dungeon and worked for an hour on Irish flute, 12-keys of scale patterns on silver flute, a few toots on the clarinet, and now I'm ready for bed.
Man, now I feel really good, and maybe a little tired. Even though it's technically Sunday and it's day 13... I am calling this Day 12, and despite what the dateline tells you, it's Saturday until the sun comes up on South Street.
I suppose that today I learned that the best sedative is self-satisfaction. Doing what you're supposed to do, and doing it in good conscience.