Babies are physiologically made to sleep in REM throughout the night in order for brain reparation. All day long they are bombarded with a million new sensations, pictures, words, motions, sounds, movements, etc etc etc etc. During naps they are so PHYSICALLY exhausted so they sleep in DEEP sleep. At night though, their brain puts their body in REM or light sleep. That is the only sleep in which their brains can repair, sort out new information and build new cells. Any noise, even their own breathing, can wake them from this. It's unfortunate but it is how they develop!
Also, babies are more comfortable with mom and or dad because during the day you give them comfort and reassurance. At night, alone in their crib, they don't get that which is why it is so difficult for them to get back to sleep after the inevitable waking.
What we have done is put a toddler bed with one side as a crib (so he can't roll out) pushed against the bed, so the open side is flush with our mattress. He sleeps there next to us. He still wakes and cries but it is so easy to console him and he's back in dream land in the blink of an eye!
Also, we still rock our son to sleep... we got an expensive stroller (we were in Norway at the time and needed something all-terrain lol) which we can lie flat. We lay in some soft blankets, pop him in and wrap him in his fav red blanky and gently roll the stroller back and forth (I play mahjong or check emails while doing this) and when he is asleep we lift him out and put him in bed. This has worked well for the past 17 months! Oh I should also mention we had a sling, Baby Bjorn, which we wore him sometimes if he was fussy.
Keep in mind he could be teething as well which could cause major disruptions. Talk to your doctor about using infant pain relief and a topical anesthetic (Dentinox is best as sugar free and used by dentists). And it's never too late to learn massage techniques! Babies of all stages love to be snuggled and touched.
And also remember, we're all as tired as each other in these stages! It obviously gets better, otherwise no one would have second or third or fourth children...or more lol!