A 'month,' as in Genesis 29, signifies the end of an earlier state and the beginning of a following state, thus a new state. 'A month' signifies a full state.

(Odkazy: Arcana Coelestia 3814)

3695. 'And placed it as his headrest' means a very general communication with the Divine. This is clear from the meaning of 'headrest' or pillow as communication with external things, and so a very general communication. For the neck or collar means the communication of interior things with exterior, or what amounts to the same, of higher things with lower, and consequently means a joining together of them, see 3542, 3603. This being so, that which goes underneath the neck or collar, that is, the pillow, here means the communication of innermost or Divine things with outermost, a communication which is also very general. For in relation to what is internal that which is external is general, and that which is outermost is very general; for the individual parts constituting interior things are seen in exterior as a single whole and so as something general. These are also what is represented and meant by the stairway set up on the earth with its top reaching up to heaven and the angels of God going up and coming down on it, dealt with further on.