It's not bad at all. You have a room with a TV. I brought my fan from home. They put these electrodes on your head and I think one on your leg and there's one on your throat. You can't even tell they are there and you feel nothing. The TV is set to go off at 10:00 and they will give you something to help you sleep if you want. They wake you at 5:00. I woke up before then, at 4:00 so they go ahead and take everything off and I leave. They go over the results and she asked me if I knew anything about sleep apnea. I said I know what it is and she said she couldn't go into much detail but that I had some episodes. They called later and said I had 31 episodes of interrupted breathing in an hour. They make an appt for you to come back and sleep with a sleep apnea mask. I had just the nasal one. They are very quiet and you go through same as first visit. With the machine I had only 1 episode interrupted sleep. They order your machine and calibrated it. Since mine is a mild case, my machine is set at 4. It goes up to 20 I think. It could go higher. It's not difficult to sleep with. My tubing is connected to piece on top of head so it swivels when you turn over. I don't think I could do the one that connects on front. There really is nothing to it. They have you show up at 7:00-7:30 and there were 4 other people having tests at same time. You are assigned a room. If you need to get up during night you tap on the table and sit up on edge of bed and they'll come see about you. You have to wear the mask a minimum of 4 hours a night for 3 months in order for medicare to pay for it. After 13 months, I'll own machine.