Gamblers usually only see the sun at dawn. They gamble all day and through the night, and if they leave it's at the crack of dawn to get home, clean up, and then go back. I haven't known a gambler who's seen the sun ... well ever!
If you're up at dawn you'll also see the あか (red) つき (moon). The あかつき only happens as the sun comes up at dawn so usually only gamblers see it. But if you get up early, you can see it too!
Currently there are no similar looking kanji which exist in the WaniKani learning system