The woman questioned Redditors on "r/AmItheA–-hole" (AITA) if she was bad for missing her sister's wedding to sleep.
After RSVPing "no" to her January wedding, Hanna stopped talking to her, the woman wrote.
The woman's mother asks her to rethink, but she says she won't go because of her sister's reaction.
She wrote, "I've had pretty awful sleeplessness since adolescence." I go to bed about 6 or 7 am and wake up around 1 or 2 pm.
She stated that Hanna knows about her sleeplessness but forgets and has tried to wake her up for family gatherings when she's home.
She was "very delighted" to receive Hanna's wedding invitation.