Ok I've been in and out of this site as DS is a pretty bad sleeper but then he'd get better again (only waking once or twice a night!) and then he'd go through a loooong bad patch again.
I've read the No Cry Sleep Solution - and although some of the things have worked, especially for getting him to go down at night, he's still waking frequently.
Usually after 1am he self-settles with no problem (until 5am when he often needs help) but before 1am it's a nightmare - last night he woke every 30 minutes in hysterical crying 
He's not brilliant at napping during the day but we do our best (I'm now back at work and his grandparents look after him and they know to focus on the napping and keep a close eye on him after 90minutes of being awake). He eats well, especially last thing at night (and often during the night).
He is bottle-fed during the day, and breastfed in the morning, evening and at night.
What books or techniques did you find useful? I'm seriously struggling atm.