I take only 0.5 mg (sometime, 1mg if I feel really stressed or anxious). It's doing the job nicely for me, without any side effects, and I am waking up very well rested the next morning. However, I am trying to not take it everyday, as Benzos addiction is very common and in some case, the withdrawal can be a real nightmare.
Also, I often prefer to take Clonazepam over Lorazepam as the effect last longer, so you are less likely to wake up in the middle of the night. But Clonazepam can take up to 1.5h to feel the effects (it takes only 10-15 minutes with Lorazepam).
In some extreme case, like if I am surrounded by a lot of noises or if I know I will not be able to sleep because I drank to much coffee or something like this, I am taking Zolpidem 10mg. That, it's really strong stuff. It will knock you out for sure, but you will feel a little bit hangover the next morning. But still, it's better to feel a little bit hangover than not sleeping for 3 days!