Yes this is still in evidence in 1.8.1 pre 4. It is NOT resolved.
It sounds like it might be related for sure, though the "intended" effect mentioned there (sound not needing to change when in 3rd person view) would not be relevant here since lying in a bed is in 1st person mode.
Tested - it is still happening in 14w21b.
I've attached a zip file of a simple test creative world set up to test this bug.
I just tested it in 1.7.5, and it is still happening. I do not have a snapshot loaded to test - perhaps someone else could, or I can re-test when 1.8 comes out.
Yes it is still happening. I've updated the affected version. Thanks.
I will double-check and report back. Thanks.
Just tested in 1.15.2, and it does seem to be fixed. Awesome!