Do therapists get annoyed when clients forget and miss sessions?

I've had the same therapist for about 2 years, and have not shown up to maybe 3 appointments. Not on purpose, just because it simply slipped my mind. I called when I remembered, and apologized. A lot has gone on since I last saw her. Good, and bad, and I was kind of looking forward to our meeting. I had a long night last night, and didn't get to bed until after 3am. I would have set an alarm for our appointment at 9am, but didn't even think of it for some reason and I woke up at 9:30am. She always calls if im like 10 minutes late, but not this time. Im afraid she didn't this time because she was frustrated with me. I called her office. I didn't speak to her directly, but I told the receptionist I missed my appointment, and we rescheduled another week from now. I know some might feel frustrated, and some might not. I guess what im asking is should I feel bad for missing another appointment?

Do therapists get annoyed when clients forget and miss sessions?
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