This cartoon is based on the word dawn.
Dawn: Dawn (noun) is the time early in the morning when the sun first appears in the sky.
"She woke up at dawn."
Dawn on somebody: If something dawns on you, you realise it for the first time. You suddenly understand something after not understanding it.
"I was going to call her then it dawned on me that I didn't know her phone number."
"It finally dawned on him what the problem was."
"It dawned on her that she could get home sooner if she walked through the park."
