Apparently, behind this character Sarah Hyland was battling with a kidney disease since she was born. At the age of nine Sarah was diagnosed with an abnormal kidney development.
In an interview, Sarah Hyland said, "I would be in a lot of pain a lot of the time. If I didn’t get, like, 12 hours of sleep, It felt, like — It felt, like, none at all...You know, if you’re sick, you still go to work. And in between takes, you sit down, or you lay your head down or something."
So if you're wondering why Haley is always seating on takes, it's because of her condition and she's in pain most of the time.
Luckily, she just had a transplant a month ago and her father's kidney matched hers. Sarah will be recuperating while Modern Family takes a break from filming.
Sarah Hyland, 21, is an ambassador for the Lopez Foundation, which promotes awareness for organ and kidney donation.
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