Sentience is an illusion created by primitive sensory organs. Maintaining a lie is a strain. It makes real contentment impossible.
Madness string 43254
This delayed reaction is actually pretty normal for the people who are involved with the funeral and all it's details. As long as you are busy, you keep it together, because it needs to be done. After the funeral, after everyone is gone, then you have finally time to grieve. And it hits you like a train.