The answers to the clues below will have something in common.

1. Parliamentary procedure question

2. Cain's post-Eden home

3. Insomniac's complaint - "I didn't ..........."

4. Cell phones, electric cars, etc. when they first appeared

 

Answers:

 

1. Point of order

2. Land of Nod

3. "I didn't sleep a wink."

4. Wave of the future 

 

Each clue contains a kind of signal - point, nod, wink, and wave.

 

Credit:

Patrick Jordan