II.in [美 ɪn, 英 ɪn]副in often appears as the second element of certain verb structures in English (close in, hand in, stand in, etc). For translations, see the relevant verb entry (close, hand, stand, etc).
It is, or was, one of travel's defining pleasures: being rocked to sleep in your couchette as a gigantic nightscape spools by, knowing your journey has barely begun.
To reduce culture shock, the participants were permitted to sleep in a modern hotel and enjoy modern activities (like television and bowling) at night.