Is this a normal side effect if letrozole?

I looked up side effects and keep seeing trouble sleeping as one if them. Anyone else sleep better with it?

I have a different medication that I have to take at the same time every day, on an empty stomach, and can't eat for an hour after taking it. So I wake up at 8 am, take it, and go back to sleep for a couple more hours. So I take letrozole at the same time. After I wake up and take it, I fall back asleep so fast (which I don't usually do) and don't get woken up easily by outside noise or my dogs running around (like I usually do). Today I did not wake up until one of my alarms went off at 3pm.

Today I took day 3 of letrozole, I have 3 more to go. Can I go ahead and switch to taking it before bed? Or do I have to keep taking it in the morning? If I do not conceive this cycle, I will definitely be taking it at night next cycle.