[chryuop]

[quote=RadioKid;715591Is this story of 雪女?

ねむりこんでしまったのです=fell in to (deeper?) sleep. I can not make other translation.[/QUOTE]
Yes it is. Yea sorry, my bad...I had misplaced the phrase in time. He is falling asleep, in fact it says:
いつのまにかねむりこんでしまったのです I am sorry for giving flase info.

As per the verb (I would scan the page, but it is Japanese-Italian so I doubt you would understand) that's what it says:

こむ　込む to be crowded with something, to be full with something. // 込んだバス crowded bus. 込む時間に at rush hour. 会場は込んでいた The living room was crowded. 通りは車が込んでいる the road is blocked by the traffic.

As per 混む there is not on my dictionary.