Please help! Habitual NW with 4 month baby.

[Qstatia]

I have a lovely, happy 15 week baby who has been waking and crying at about 5:30am every day for months.  He'll wake and cry for a minute or two, settle back down, then wake again 15-30 minutes later and do the same thing and continue like this until his 8:00 wake up.  Once or twice a week this will start at 3:30am.  Sometimes he's up for so long that he'll eventually pass back out and I'll have to wake him up at 8:30am.  I've been trying wake to sleep for the past 3 nights but so far there is no change.  I'm exhausted and at my wits end because I don't know what's causing this.  It's not hunger, I've tried feeding him a few times and he'll just have an ounce or two and pass back out.  He's a really big baby (17 pounds already at 4 months), I'm wondering if stopping the dream feed might help.  Any opinions on this?  He gets about 7oz per feed.  Sometimes he drinks it all, sometimes he'll leave 2/3 oz.  I was thinking about changing all the bottles to 8oz and dropping the DF to see if that will help.  Any other suggestions are welcome since I don't know what else to do.  My pediatrician says that he should outgrow this by 5 months or so but I don't believe her!

Here is a "typical" day (times can vary by 15-30 min depending on what time he wakes up)
8:00 - Feed
9:45 - Sleep (2-2.5 hours)
12:00 - Feed
1:45 - Sleep (1.5-2 hours)
3:30 - Feed
5:00 - Sleep (45m-1hour)
7:00 - Feed
Bath
7:30 - Bed

Thanks!
Statia

[Qstatia]

Sorry, and then a DF at 10:30.

[yaya]

Hmmm toughie. I'm wondering whether 2.5 hrs as first nap is a little too much? this can often cause EWs. Is it more often 2 hrs or 2.5 hrs?

[Qstatia]

The first nap is usually 2.5 hours.  This started about 2 weeks ago, before that he was on the 3 hour EASY and most naps were 1.5-2 hours, but when he started taking the longer morning nap we switched to the 4 hour EASY.  Do you think extending his A time would help?  Right now it's 1:30 or 1:45.  I could try for 2H but I've been afraid he'd get too over tired.  The only reason I'm not quick to blame that long morning nap is because he's been doing this for months and that long nap just started recently.

[yaya]

Honestly, it's worth a shot

[Qstatia]

I kept him awake for 2 hours in between naps yesterday and he woke up at 4:30 this morning and pretty much cried on and off until 7:30 when I got him up for the day.  I am so exhausted.  He's in the room with me so I'm only getting 5 hours of sleep per night which is not nearly enough for a mom of 2 who's working full time (in fact, I'm so run down I've had a fever for the past 3 days).  I only have a 2BR apartment and the plan was for the baby and my 2yo to sleep in the same room, but that's not happening because he wakes her up with the crying too.  Should I try PU/PD? 

[yaya]

Def try pu/pd, what are you currently doing?