Good lord, there are some judgy comments here - speaking out in defence of the 'poor men' who aren't getting their end away because their partner is selfish enough to breastfeed and respond to their baby's needs 
So me and DH haven't done longer than a few nights in the same bed since DD was born. In 2015. Come at me, haters! A combination of late pregnancy insomnia, breastfeeding and the fact that DD just didn't like to sleep. For two years. She's now in her own room and sleeping through. But we have also have DS (3 months) and once again I'm sleeping separately from DH.
We do it like this because the rule in our house is, sleep is more important than anything else, and we do what we can to get it. Both of us suffer when we are tired, but DH has a physical condition that is aggravated by lack of sleep. Plus a long commute by car for work. I'd far rather he was rested and able to support me with weekend lie ins and doing everything else.
As for intimacy...well, despite the separate beds we still managed to conceive DS! You just have to create time and think outside the bedroom. By the time I'm in bed, I'm way too exhausted to even read, let alone get physical, so bed sharing wouldn't make much difference! And as for the mornings...well, those of you with small children will understand why you never need an alarm clock...
My libido is very low right now, I'm breastfeeding, knackered and feel touched out. It's totally normal to feel this way.
I do sometimes worry about the impact on our marriage, but as PPs have pointed out, it's all about keeping the lines of communication open, and being affectionate with each other where we can. We know this stage won't last forever, and I'm grateful that my DH appreciates what I'm doing for our DC and doesn't pester me.