Why don't my parents sleep in the same room together anymore?

Sometimes my dad sleeps on the living room coach while my mom is in a queen size bed by herself, other times it's vice versa. I don't get it. They have such a nice comfy bed and don't sleep on yet while I'm forced to sleep on a twin sized bed, and I'm like 6'3".
Why don't my parents sleep in the same room together anymore?
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