Helicopters in my Mind

Yesterday I had my first past hypnotherapy session. She took me back to a 'happy childhood memory', through when my mother was pregnant, when she gave birth, to before her pregnancy. There were no traumatic memories that came through, just an incredible feeling of sadness.
The only odd thing was that while under at some stages was so distracted by the helicopter outside that I could not concentrate. The sound was so loud it sounded liked it was landing in the courtyard outside. When I mentioned this S said she did not hear it, that she only heard the children cough and once the tap was on or something, that she is hypersensitive to anything which can intrude on the client.
How can that be! I clearly heard a helicopter very close to me? S said it must be part of my memory as it was not part of the present. So I need to ask my Mom about this.
I felt 2 distinct presences. Both Native American, ancestors I feel. A strong, muscular brave who would appear when she mentioned protected or safe or other key words. The 2nd an old NA woman with a grey braid. She appeared on words like love, worthy, cherished...sh ewould hug me. I feel she may be White Buffalo Woman. I then woke up.
Then she told me I might be very tired and maybe it was the power of suggestion but I came home and slept for about 10 hrs, got up, went to bed and slept til morning!
I feel great today.