Hi Laurel,
Good to see you!
Everyone seems to respond differently to LDN. The main reason to take it at night is to avoid being awake during the few hours when your opiate receptors are blocked--some people feel kinda down during this period.
The other reason (which is not agreed upon by researchers OR patients, is that apparently the body produces the most endorphins around 2 or 3 am and if your opiate receptors are blocked then, the body will produce more to try to "fix" the problem. More endorphins translates to LDN being more efficacious.
That said, many patients take it during the day successfully and don't experience any problems. I take it at night but at the beginning and every time I raised my dose, I had to take more sleep aids for a few days to counteract the LDN induced insomnia. Now, after being up to 4.5 mg for a good while, it actually helps my sleep.
As to how fast people get response--again individual. Some find they have to "hit" a certain dose before they get a good response, some respond immediately. Also the effect builds up over several months. For me I noticed a difference in energy and immune function immediately, but when I reached 3.5 mg there was a sudden really noticeable improvement.
I raised the dose very, very slowly and it took me about 4 months to reach 4.5 mg. I waited till I didn't notice any more changes at the dose I was on, then waited a few days more, and raised the dose.
I hope you find help with this. Experiment with the time to take it, the doses etc. I would just caution raising the dose quickly as some have had extreme immune responses to "old bugs" and spiked a high fever.
Best,
Sushi