"If you're tired, why don't you go to bed?" "Because if I sleep now, I'll wake up too early."
Literal
"If tired-[progressive-ている-conditional-なら] sleep-[if-たら] how?" "I [subject-が] now sleep-[if-たら] too early wake-up-end-up [reason-から]"
Two conditionals stacked. The first speaker uses ~たらどう, the standard suggestion pattern ('how about X-ing?' = 'why don't you X?'). The reply uses ~たら as a hypothetical conditional plus ~てしまう ('end up,' marking unintendedness) — 'if I do X, I'll end up Y.' Both conditionals here are temporal/hypothetical ~たら, but with different rhetorical roles.