After Aldrin and Armstrong completed their EVA, Collins slept so he could be rested for the rendezvous.
ˈæftɚɹ ˈɔːldɹɪn ænd ˈɑːɹmstɹɔŋ kəmplˈiːɾᵻd ðɛɹ ˈiːvə, kˈɑːlᵻnz slˈɛpt sˌoʊ hiː kʊd biː ɹˈɛstᵻd fɚðə ɹˈɑːndɪvˌuː.