Attn rabbi Rosenberg; the Talmud in Sukka 26b says that "the kids" (The bochurim) may never sleep with the Tfillin on, because they are likely to see tumah (kerry) (Because of bad thoughts (Rashi). And even though the Talmud ends up saying that we're not talking about bochurim but rather young couples (And not kerry), the facts about kerry don't change.
Hay, look at this! The young couples sleep together in the same bed, and they may fool around and touch dirty places. (Sukka ibid) (See the end of July 31, 2011)
When you sleep together you have to make up every night before you go to sleep. Uh-oh!!