Dementia is a progressive decline in thinking, memory, and the ability to learn. People with dementia need help with basic activities, such as cooking and bathing. Most also eventually need around-the-clock supervision from caregivers. Because the need becomes constant, many caregivers become depressed and exhausted. Support helps the depression and exhaustion. It can lead to improvement in dementia symptoms and can also delay the caregiver's need to send the person with dementia to a nursing home. However, most caregivers do not receive the support that they need.