As ever when we reach explanations in the n th degree of unlikeliness it is to the obvious one should look.
Most "sleeping receivers" are almost certainly are brought about by sleeping pilots.
Rationale? There being hundreds of alert pilots for every sleepy one we should be swamped with credible reports from alert pilots who have caught their receivers asleep yet we are not.
Oddly, "Sleepy receivers" only seem to get detected by ATC, and anecdotal evidence is often that the initial response from aircrew once the "receiver" has awoken is far from alert.
Go figure what the "sleepy receiver" really is...
Last edited by Wageslave; 10th Mar 2016 at 15:27.