bear - the DF is a personal decision. It has to work with your lifestyle. If you're already in bed, and would have to get up to give it, then might as well wait for baby to call for you! However, I also thought DF disrupted sleep. And at first it did! But after a week, he got used to it and doesn't ever wake up now! I know that sounds crazy, because you're lifiting them out of the crib, etc. But if they are already in a deep sleep, they'll stay there most of the time. Again, it has to work with your schedule. If it were me, I'd do what you're doing - just wait for a hunger cry since you're already asleep! I'm having trouble with DF right now because my DH is not able to do it anymore due to work conflicts, so I'm having to do it and I'm used to going to bed at 8:30/9:00! That's why I'm hoping to get rid of it SOON! LOL!
Yes, LO's eyes would often open. There were 2 kinds of eye openings; one would be where he would open them sleepily stare about blindly, then shut them again. It was clear to me he WANTED to shut them. The other was where he'd come sTARK awake, and then I knew it would be a battle getting him back to sleep. But at 3 months old, he didn't see it as a signal to play. That didn't happen until about 6 months for us, but I think all LOs are different that way. I think you could probably experiment a bit. I was REALLY scared to experiment myself, but if naps are short anyway you have nothing to lose! I also want you to know that WTS or holding thru the jolts takes a while to work. Do NOT be discouraged if it doesn't work the first 9 times you try it, because suddenly on the 10th your LO will turn their head to the side and put themselves back to sleep!
In fact, in our case, what happened was his naps were short. I was in despair. I was doing WTS and holding down. I just got used to hearing him wake up sometime between 30-45 minutes. I dutifully went up to do what i'd been doing for 3 days, I didn't even pay attention to what I was doing I was so hopeless. But, all of a sudden I realized I was trying to shove a paci in his mouth and he was turning his head away from me! So, I finally STOPped and watched him: he was puttng himself back to sleep! I couldn't believe it because the other 9 times I tried it, he was nowhere near putting himself to sleep. After that, each day he jolted less, cried less, and went to sleep faster until I didn't even hear him stir at the 45 minute mark anymore! since then, we've had short naps on occasion, but we've been able to nip them in the bud within 1-2 days insteady of 7.