asthma & trouble sleeping

I'm in my 20s and have had asthma all my life. Either it's poorly managed or I'm just unlucky but I seem to suffer so much with it.
I guess I'm trying to work out how much problem other people have with sleep?
I tend to wake up every few hours either coughing or wheezing and usually i use my inhaler and it helps and I get back to sleep but then wake up again 2 hours later with the same symptoms.
I do take a preventative medication daily and throghout the day my asthma is generally okay (use my inhaler about once per day unless it's spring, or cold weather, or I'm exercising etc - then I need to use it 2-3 times a day).
I just have most problems at night and it's hard because it wakes my partner up and I feel bad.
I'm so sick of being sick.

My cough is fairly constant but seems better during the day in terms of not accerbating my asthma too much, like it does at night.
Can anyone help me work out how to sleep better and not have so much asthma during the night?
It's wearing me down.