That can be mitigated somewhat by having the stand up meeting first thing before people have started other tasks, but really that rarely works if people are interested in their work enough to get to the office early. You just have to take the hit, and readily accept that people will skip the meeting if they're deep in to something else.
The other time to hold it is just before lunchtime. This has the dual benefit of encouraging people to be brief (hunger is a powerful motivator ;-) and breaking at a time when people would have to break anyways. I also like holding it midday rather than the very start or end of the day because those times encourage staying late or coming in early to resolve an issue before standup. Lunchtime is also usually a time when everyone (apart from remote team members) is in the office no matter what schedule they keep.
