It is very easy for people to become demoralised or demotivated during change as work becomes harder (less familiar) and possibly less rewarding (we’re not yet skilled at it). At the same time there is often a sense of loss of past habits or pleasurable activities, and a disruption to rewarding relationships. At the same time the manager can be so distracted and pressurised with all the meetings and decisions to do with the change programme that they are less relaxed and more critical than usual. They may also be around less, removing a valuable source of positive feedback for people.
To counter-act this, to ensure that people maintain good morale, are motivated, effective and resilient, we need to concentrate on helping people maintain a positive emotional state and a belief in their ability to influence things happening in their world.