The organisation has said 'Safe Care' must be the priority.
Some 20 patients are on trolleys in Naas General Hospital today.
Over 631 patients are on trolleys in Irish hospitals today according to the Irish Nurses and Midwives Organisation.
University Hospital Limerick remains the most overcrowded, with 93 patients waiting for a bed today.
That's followed by Cork and Galway University Hospitals, with 77 and 56 patients respectively.
Naas resident and INMO General Secretary Phil Ní Sheaghdha commented: “As predicted, it has been an incredibly busy weekend across all hospital sites.
“It is unacceptable that 140 patients are on trolleys in inappropriate bed spaces on hospital wards.
"The HSE must direct hospitals to cancel electives and concentrate on the de-escalation of trolleys from understaffed and overburdened wards.
“It is obvious that in times of severe overcrowding such as this weekend and going into the week ahead, that our public hospital system cannot provide both safe emergency and elective care.
"The provision of safe care must be the priority.”