You're baby isn't afraid of the dark, think where she was only four days ago- total darkness. It's being separate from her parents touch that wakes her. She has no idea about day or night yet.
The early days with a new born are so hard, I had just no idea when we had ds the intensity of the attention they need or the sheer weight of responsibility I would feel. There are a few ways to cope IMHO;
-Take turns. This is what we did with ds (our first). I would bf then hold him whilst I watched a film, bf him again then wake dp and he would hold him whilst I went to sleep. We did this for ten days before he'd settle in his moses basket for short periods.
- Co Sleep. This is what we/I did with dd. Dp moved to the spare room and was in charge of ds. I was in our bed with new born dd. This was a much better set up than taking it in turns. Look up safe co sleeping. Was your baby very early or low birth weight?
- Sling- We had a Caboo Close and it never failed to send her to sleep. You could have her in it to let your wife get some rest.
-Take every sleep opportunity. We were really bad at this with ds. If your baby is asleep one of you should be asleep too. Until things settle down at least.
-Guests. Visitors have to be heavily restricted. This is your job!! Important people, ie immediate family can show up, look at the baby, leave food, walk the dog then go home! You need to make it clear to them that there won't be any cups of tea made by you or your wife!
-Crying. I cried every day for 20 days after having ds. It's too soon to be thinking about pnd I think, more like baby blues at the minute. It's horrible but will pass. Cuddle her a lot.
- A bottle. Id hold off if your wife feels she possibly can as bottle feeding this early could really compromise bf. Your wifes milk will come in soon and your baby's stomach will grow so she'll go longer between feeds.
I look back at the first two weeks with ds and shake my head at myself! We were trying to do supermarket shops, entertaining guests, visiting family (it was Christmas)etc. All whilst feeling absolutely broken and sobbing as soon as we were alone. Box set for the tv, snuggles on the sofa, any sleep you can anytime you can get it, any nice food you can muster up, plenty of fluids, pain killers.....if you feel up to it maybe a walk- and no more!
This is the hard yard. It will be easier in a week I promise. Congratulations!