If the round bit/side of the moon fits into your curved RIGHT thumb and first finger, it's gRowing, or waxing. If it fits into your curved LEFT thumb and first finger, it's getting Little, or waning. (In the northern hemisphere.) I don't know what it's doing on the Turkish flag.
Is the crescent moon supposed to indicate that you are off to bed? (Sorry, might be being a bit dense here) if so, please can it have one of those nightcaps with a bobble on it, please? And sleepy eyes, and "zzzzz's" coming out of its' mouth?