It varies. Some people remember nothing about an episode of delirium. Others remember fragments, or remember frightening scenes very clearly.
Families usually hope they forget it all, and often that is what happens. Days pass in a blur and afterwards there is a gap.
But many people are left with some memory of it, and it is usually not the ordinary ward routine. It is the frightening parts. Being held down for a blood test they did not understand. Believing the staff meant them harm. Seeing someone in the corner of the room. Being certain they had to get home, and being stopped. Those memories can feel more real afterwards than the things that actually happened, because at the time they were real.
When the memories cause lasting distress
Frightening memories of delirium can leave people anxious, low, or unwilling to go back into hospital. After intensive care in particular, the effects can look like those of any other frightening experience. This happens more often than most families are told.
What helps
What helps is being allowed to talk about it without being corrected. If someone tells you the nurses were trying to poison them, they are not making an accusation. They are describing what their brain gave them at the time.
You do not have to agree that it happened. You do not have to argue that it did not. Something like: “That sounds terrifying. You were very ill and your mind was playing tricks, and none of it was your fault.”
Then let them tell you as much or as little as they want, more than once if they need to.
It also helps to fill in the gaps for them: what day they came in, what was wrong, what was done, and how long it went on. Families are often the only people who can supply that, and having a clear account of what actually happened takes some of the fear out of the fragments.
When to see the GP
If someone is still distressed by the memories weeks later, avoiding anything that reminds them of it, sleeping badly or having flashbacks, take it to the GP. This can be treated, and it is not something to wait out.
When to get help
New confusion that has come on over hours or days needs medical advice the same day. Phone the GP practice, or 111 when it is closed. Phone 999 if the person cannot be woken, has collapsed, or has new weakness or new trouble speaking. When you speak to someone, say what has changed. Then ask: could it be delirium?