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See 3:41 and the corresponding note [29].
The "Sign", was in order to convince Zakariya that the Lord's promise was true.
Compare this verse with iii. 41. The variations are interesting. Here it is "for three nights": there it is "for three days". The meaning is the same, for a day is a period of 24 hours. But the point of view is different in each case. There it was from the point of view of the Ummat or Congregation, among whom he worked by day; here the point of view is that of his individual soul, which spent the nights in prayer and praise. Notice again that at the end of the next verse, we have here, "In the morning and the evening", and at the end of iii. 41, "In the evening and in the morning"-showing again that the point of view is reversed.