A wizard casts Sending on a target creature who happens to be sleeping at the time.
You send a short message of twenty-five words or less to a creature with which you are familiar. The creature hears the message in its mind, recognizes you as the sender if it knows you, and can answer in a like manner immediately.
What happens? Some possibilities off the top of my head:
- The creature is asleep, and so does not hear and cannot respond to the message.
- The creature is awakened by the message in its mind, and once awake hears it and can respond to it.
- The creature is not awakened by the message, but hears and can respond to it perfectly lucidly despite still being asleep.
- The creature is not awakened by the message, does hear it, but is asleep so cannot process it lucidly. Thus they might not remember the message and might respond to it with the mutterings of a sleeping person ("Five more minutes Grandma Frog").