At 55 years old, Chris Roberts often gets lost in his own home. At times he has to ask his wife, Jayne, how to get to the bathroom and regular household appliances, such as a kettle, can confuse him.
Chris is one of the 850,000 people in the UK living with dementia.
In a BBC Panorama special, cameras follow Chris, his wife and his youngest daughter, Kate, as they come to terms with his diagnosis.
Five years ago, the former property manager was diagnosed with both vascular dementia and early onset Alzheimer’s disease after he started displaying behaviour that was out of character, such as unwarranted anger.
Open Image Modal
BBC
According to the NHS, vascular dementia is a form of dementia that is "rare in anyone younger than 65".
It causes a decline in mental ability and is caused by reduced blood flow to the brain, which damages and eventually kills the brain cells.
Meanwhile the exact cause of Alzheimer's disease is unknown, but it is a progressive form of dementia which affects multiple brain functions, including memory.
"The best thing you can do after your diagnosis is read up about it, find out all you can. It's the unknown that scares us," Chris says in the programme.
"Some people try and hide from their dementia, hiding is easier than facing up to it sometimes. But you can only run for so long – dementia will catch you up.
"You will have to face it, you will have to live with it."
Over a period of almost two years, the family invited a small film crew into their home, created their own video diaries and had CCTV cameras fitted in all rooms to give a unique insight into what life with dementia is really like.
The documentary follows their highs and lows, from bittersweet moments like Christmas day to a heartbreaking scene where Jayne struggles to comfort Chris as he screams in distress for no apparent reason.
"The person I miss most, is me," Chris says.
In one clip, Chris explains what it's like to wake up in the morning, confused about where he is and what's happening.
He wanders around, shouts and searches for his wife, then says: "Trouble is, I don't know whether I'm dreaming or not. Can't find any notes...
"It’s really strange when you don’t know what’s real and what isn’t."
The programme also reveals what it's like to be a family member of someone with dementia.
Jayne opens up about her feelings of guilt as she drops her husband off to a daytime respite centre and Kate says having a dad with dementia "isn't all doom and gloom" as in many ways the illness has made them all closer.
"I need respite and I didn’t think I’d ever say that," Jayne says.
"He wants to go in and have respite overnight for himself. I’m not ready to let him do that.
"One of my biggest worries is that I won’t want him to come home. I might like him being there."
The family decided to take part in the one-off programme as they wanted to dispel myths about dementia and raise awareness of what living with Alzheimer's disease is really like.
"I really hope that the programme helps people and doesn't scare them. I haven't done this to scare anybody," Chris says.
"You've seen that I still live, I still have a life. Just a different quality."
'Panorama - Living With Dementia: Chris’s Story' is on BBC One tonight (Thursday 2 June) at 8pm.
Early Symptoms of Dementia
No Initiative (01 of10)
Open Image Modal
At times everyone can become tired of housework, business activities, or social obligations. However a person with dementia may become very passive, sitting in front of the television for hours, sleeping more than usual, or appear to lose interest in hobbies. (credit:John Rensten via Getty Images)
Changes in Personality (02 of10)
Open Image Modal
A person with dementia may seem different from his or her usual self in ways that are difficult to pinpoint. A person may become suspicious, irritable, depressed, apathetic or anxious and agitated especially in situations where memory problems are causing difficulties. (credit:fStop Images - Carl Smith via Getty Images)
Mood Changes(03 of10)
Open Image Modal
Everyone can become sad or moody from time to time. A person with dementia may become unusually emotional and experience rapid mood swings for no apparent reason. Alternatively a person with dementia may show less emotion than was usual previously. (credit:Mike Chick via Getty Images)
Misplace Things (04 of10)
Open Image Modal
Anyone can temporarily misplace his or her wallet or keys. A person with dementia may put things in unusual places such as an iron in the fridge or a wristwatch in the sugar bowl. (credit:Oli Kellett via Getty Images)
Problems With Keeping Track of Things (05 of10)
Open Image Modal
A person with dementia may find it difficult to follow a conversation or keep up with paying their bills. (credit:Chris Red via Getty Images)
Increasingly poor Judgement(06 of10)
Open Image Modal
People with dementia may dress inappropriately, wearing several layers of clothes on a warm day or very few on a cold day. (credit:Jessica Peterson via Getty Images)
Distortion of Time and Place (07 of10)
Open Image Modal
We sometimes forget the day of the week or where we are going but people with dementia can become lost in familiar places such as the road they live in, forget where they are or how they got there, and not know how to get back home. A person with dementia may also confuse night and day. (credit:Jupiterimages via Getty Images)
Problems With Language(08 of10)
Open Image Modal
Occasionally everyone has trouble finding the right word but a person with dementia often forgets simple words or substitutes unusual words, making speech or writing hard to understand. (credit:Jupiterimages via Getty Images)
Difficulty Performing Familiar Tasks(09 of10)
Open Image Modal
People with dementia often find it hard to complete everyday tasks that are so familiar we usually do not think about how to do them. A person with dementia may not know in what order to put clothes on or the steps for preparing a meal. (credit:Anthony Harvie via Getty Images)
Memory Loss(10 of10)
Open Image Modal
Declining memory, especially short-term memory, is the most common early symptom of dementia. People with ordinary forgetfulness can still remember other facts associated with the thing they have forgotten. For example, they may briefly forget their next-door neighbour's name but they still know the person they are talking to is their next-door neighbour. A person with dementia will not only forget their neighbour's name but also the context. (credit:Compassionate Eye Foundation via Getty Images)