It all depends on what you need and want.
You have a range of options.
If you just want to check whether you're at risk of OSA, I can send you an Apnea Risk Assessment test to do. It's free and you can do it anywhere anytime. (SnoreLab is for people who are interested in hearing whether / how loud they snore. If they already know they snore and don't particularly want to hear it, the risk assessment is a more valuable thing to send them.)
At the other end of the scale there are true diagnostic sleep studies. Polysomnograms, which monitor everything that happens while you're asleep. Breathing and snoring patterns. Number of times you stop breathing. Heart activity. Brain activity. Blood oxygen levels. Position. Leg movements and more.
These studies cost money but they are true diagnostic sleep studies, not just a screening. Instead of your diagnosis being calculated by an algorithm, you get a true diagnosis done by a sleep scientists and sleep physician. That means true DSS are recognised by Medicare and the health funds, so if you need any treatment your health fund will make a contribution.
There are also multi channel screening devices you can get online and through pharmacies, and they are quite inexpensive and good as screening devices. But they are not advanced enough to provide a true diagnosis of the nature and severity of your condition, so they are not recognised by Medicare or the health funds, so just be aware of that.
The important thing is you're moving toward finding out why you're feeling the way you feel.
So, from those options, where would you prefer to start?