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Here is what we have done (on the occasions when we have experienced noticeable rest-requirement differences)....you can take it, leave it, or use it as a leaping point for how you move forward:

In order to eliminate a morning nap, we made point to try to "get out" (or have an in-house structured but calm activity) in the morning hours...typically a stroller excursion to a mall, park, or even Wal-Mart-esque errands. That way, if the "sleepy" baby truly needed the rest, he/she could "conk" a bit in the meandering stroller. However, more often than not, the visual stimuli and social contact of being out and about enabled the "sleepier" twin to remain awake while not over-exerting and expending a lot of physical energy. Conveniently, the morning adventure served a dual purpose in that the non-morning nap needing twin was sufficiently stimulated (or at least verbally convinced by mom!) into needing an "earlier start" to the afternoon nap. I also made a big point of extending the duration of the afternoon nap to compensate for the "lost" morning sleep. We also started bedtime earlier by 15-30 minutes when surly babies dictated we'd obviously underestimated nap needs for the day.

Even though we often had one twin who seemed to need less sleep, periodically that same child would suddenly sleep longer and harder than the twin who seemed to be the "needier" in the rest department. Growth spurts and windows of rapid learning are non-synchronous, and may well occur with less-predicability than in those early weeks with young twins.

Needless to say, at 15 months, you are at a point where your twosome is clearly going to gravitate to a single nap. BUT, when it comes to eliminating naps altogether, think twice before rushing to judgment. Personally, I am reticient to view behavior of only a few days to dictate sweeping schedule changes for the full family.

Our three and a half year-olds STILL often take a nap in the afternoon. Granted, on occasion, it is merely a "quiet time" in their still-shared room with a book each and music, but then other times, one or both are down for the count. Often they sleep when I think they won't, and stay awake when they seem exhausted. Keeping a pre-determined time-frame for "rest" seems very appropriate for our family still. At age 2 1/2, there were numerous consecutive days in which neither actually "napped". Many friends have been quick to determine their kids were "done" with naps only to discover later they had weeks of perpetually groggy and cranky youngsters. At that point, and if it happens to you (or us!), earlier bedtimes seem the viable solution. (I'm of the school of thought that once you say naps are a thing of the past, you need to stick by that "milestone" achieved. I just wouldn't ever "rush" to that conclusion!)Attempting to re-institute a daily rest after declaring them unnecessary would be tricky in our house, I know!

Now, if we are doing particularly well, having a very fun outing with great behavior, we on occasion "skip naps"...making a point to state it is a special, behavior-merited instance. When we do so, we ALWAYS start bedtime 30-45 minutes earlier to compensate for the extra activity with minimal mid-day rest. When we do have the rare occasion in which we have no nap and no opportunity for an early bedtime, we can count on a night of numerous wake-ups and disturbed sleep. Until I had twins, I never really understood what people meant by "overtired"....for children OR adults!

Hopefully some snippet of this is helpful. Any shift in routine is tough. Once you have determined a good duration, start and finish times for the afternoon nap, have adjusted the start of bedtime as you see fit, and have implemented the new schedule for 3-5 days, I'll bet you will find yourselves getting in a good rhythm.

Be ready to modify the routine again in future months...and let me know if there are specifics you'd like addressed beyond my mini-diatribe here.