Good list, let me add some more:
1. Don't eat or drink three hours before you sleep. Makes it much easier. But at the same time, if you're genuinely hungry or thirsty when going to bed, that's not good either. Be smart and have a small snack and drink a few hours before going to bed, don't wait until you're so hungry/thirsty that you overdo it, and end up going to bed with too much food/liquid in your body. Really bad for your sleep.
2. Take a hot shower/bath before bed. Always helps.
3. Make the room a little colder than is comfortable without covers. Better to have it be a little colder, than too warm.
4. Lie down in supine position. (It helps you remember your dreams & prevents some back problems.)
5. Turn off all electronics besides a fan.
6. Don't necessarily count, but listen to something repetitious. I usually listen to my ceiling fan. Some people listen to their heartbeat or breathing. If that doesn't work, there's another kinda neat trick. Make yourself feel as if you're sinking into your bed. Start from your feet all the way up to your head. Whenever I do that, I usually fall asleep a few minutes later.
7. I personally find wearing long-sleeved/pants PJ's makes for a better night's sleep.
8. Always sleep in different clothes than the ones you wear during the day. Apart from there being a psychological link, it's not hygienic to sleep in the same clothes.
9. Tossing and turning is usually not a good idea, but if a position really isn't working, try another one. This applies to more than just sleeping, lol.
10. Think of something positive in the (near) future. It doesn't have to be a completely planned out something, but good prospects to think about, the kind that don't pose too many new questions or dilemma's, always work to end the day on a happy note and calm your mind.
11. This should be obvious, but have it be completely dark. We are trained to wake up when exposed to daylight. This is bad when you don't have to get up ridiculously early, especially in the summer the sun is up earlier, but that shouldn't mean we all need to get up earlier.
12. For some people it works to set an alarm even if you don't need to get up, so you're like "I need to sleep soon so I'll still get 8 hours of sleep before being woken up". Doesn't work for everyone.
13. Try to achieve a feeling of being one with your bed/sheets/pillow. Similar to the feeling of sinking into your bed, you have to feel warm, comfortable, cozy, and relaxed.
Is it obvious I have insomnia? Lol.