No Sir Alan - I'm afraid I don't think they would have noticed so it might go something like this.....
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"Whats that?" - Previously slumbering flight prevention bloke / chappess
"Thats the 5pm alarm sir / sarge / ma'am / flight" - Heroic FOM / FOA type chappy / chappess
"Bu**er - I've overslept by 2 hours" Previously slumbering flight prevention bloke / chappess swiftly (for once) exiting the tower.