To co-sleep or not to co-sleep.

We have been sleeping in the same room for nearly 5 years now. All 4 of us. Me, my husband, my nearly 5 yrs old son, and another 30 months old son. In 2 months time, another child will probably occupy the same room. So far all of us keeps alternating, consciously or unconsciously, between the queen-sized bed and the single-sized matress. I'm not really sure when this pattern will stop. I'm starting to worry if it's actually good or bad for the children. So, have been surfing the net and found out that there are some benefits of co-sleeping for children:

1) One study reported mothers getting more sleep by co-sleeping and breastfeeding than by other arrangements.
2) Stress hormones are lower in mothers and babies who co-sleep, specifically the balance of the stress hormone cortisol, the control of which is essential for a baby's healthy growth.
3) The physiology of co-sleeping babies is more stable, including more stable temperatures, more regular heart rhythms, and fewer long pauses in breathing than babies who sleep alone.
4) Co-sleeping promotes long-term emotional health.
In long-term follow-up studies of infants who slept with their parents and those who slept alone, the children who co-slept were happier, less anxious, had higher self-esteem, were less likely to be afraid of sleep, had fewer behavioral problems, tended to be more comfortable with intimacy, and were generally more independent as adults.