It helps to get mindful and in the desired state while preparing for bed, rather than lying down and possibly either falling asleep or getting lost in daydreaming. It’s a little counterintuitive, but one trick to this is to not try to hard. Getting very into it, with strong emotion, can keep you awake, and a good nights sleep is more important than nailing this. Don’t do anything that causes sleep imbalance for you.
One thing to try is to have some shrine or representation of your intentions by the bedside, try and make it the last thing you see when turning the light out and closing your eyes, and also the first thing you see when awakening and opening your eyes. If you wrote a small manifestation script, you could fall asleep holding it, then find it when you wake up in the morning and put it back on the shrine.
The ‘shrine’ could be whatever you want. A single religious picture or enso, or a simple enso (circle) drawn on a piece of paper. If you are using my numerology method to stating intention which I wrote about elsewhere, you can draw and feel the enso on and in your chest the number of times according to the current manifestation number.
Another practice is to fall asleep in an ‘astral temple’. What I mean is that, as you are preparing for bed, then you can imagine, by ‘projecting into cubic reality’ that you are in a temple that celebrates all your manifesting themes being fulfilled, with statues and deities, a Nembutsu Buddha and pictures of the goals on the wall, like a mental Nembutsu chanting shrine if you are using one.
So you are in two worlds getting ready for bed and when you are lying down and your eyes are closed, you are completely within the shrine. Forget the bedroom or wherever you are, you can project the shrine all around you. If you don’t use the Buddhist shrine but like Hermetacism more, you could project a magick circle around you, with the elements open, wind blowing leaves in the east and a lake in the west, fire south and entrance to a diamond mine in the north, a raised manifesting triangle in a relevant quarter has rotating pictures rising from it from your manifestation practice, and you see them rotating sequences as you lose consciousness.
If you are trying to manifest being in a different place, a hotel on holiday or new apartment, then be there now getting ready for bed. So, for example, closing the curtains, pay no heed to the physical curtains that your physical eyes tell you is existing in the dead world of the past. Be aware of your mental/astral body permeating your physical body, and close the different curtains of your new abode, feel the different texture with your spiritual hands (disregarding the dead physical) and smell the newness of the fabric with your spiritual nostrils. Brush your teeth at the luxury Italian marble sink.