Why are transitions between tasks or phases especially disruptive to my arrival timing in ADHD 

Adults with ADHD often experience marked difficulties with planning, organisation and time management. These challenges are linked to deficits in executive functions such as task switching, working memory, inhibition and time-based prospective memory. Together, these processes allow us to stop one activity, remember the next step and act at the right moment. According to NICE guidance and NHS advice, adults with ADHD frequently struggle with transitions like leaving home or finishing work to travel and benefit from psychoeducation, structured routines and external aids such as alarms, reminders and planners to stay on time. 

Why transitions are hard in adult ADHD 

A 2025 review of cognitive impairment in adult ADHD found broad deficits across executive functions including working memory, inhibition and cognitive flexibility, all of which are critical for moving from one activity to another. These weaknesses make it harder to stop current actions, hold future goals in mind and start new tasks on schedule. Research on time perception also highlights that many adults with ADHD experience reduced awareness of time passing, sometimes described as “time blindness,” which leads to missed departures or delays when switching between tasks. 

Prospective memory, task switching and lateness 

A PLOS One study examining complex prospective memory found that adults with ADHD showed major impairments in planning and carrying out future intentions, particularly those requiring time-based awareness (“act at 8:15”). This contrasts with event-based tasks (“act when something happens”), which were less impaired. Reviews of time perception in ADHD confirm difficulties with time estimation, reproduction and monitoring, which translate directly into everyday lateness and disrupted routines. Virtual and naturalistic studies show that adults with ADHD check the time less often, explaining why transitions, especially those driven by a schedule rather than an external event, are so easily missed. 

NICE and NHS guidance on time management and transitions 

NICE NG87 states that people with ADHD often have “difficulties with organisation, time management and prioritising tasks.” It recommends psychoeducation and CBT-style interventions to build these skills, alongside practical aids like planners and visual reminders. The NHS Lothian Self Help Resource Pack encourages adults to set phone alarms “to remind me when to get ready and when to leave house,” and to use calendars for daily structure. The East London NHS Foundation Trust’s Adult ADHD Support Resource Pack also recommends setting multiple alarms to structure morning routines and improve punctuality. These resources consistently emphasise external structuring tools to help adults manage transitions and arrive on time. 

Cognitive and neurocognitive explanations for transition difficulty 

Executive-function models identify three key components: working memory, inhibition and set-shifting. All three are commonly affected in ADHD, making transitions particularly difficult. Working-memory deficits impair the ability to remember future steps, inhibition problems make it hard to stop current actions, and reduced cognitive flexibility slows switching to new tasks. Studies such as Nature Scientific Reports 2025 have shown measurable impairments in set-shifting and planning that align with real-world disorganisation. Further research on time-based prospective memory shows that people with ADHD monitor the clock less and rely more on external cues. This explains why alarms, reminders and structured routines can be essential for managing transitions effectively. 

Practical implications for time management and transitions 

For adults with ADHD, transition difficulty is not a matter of willpower but reflects specific cognitive differences. Weaknesses in planning, working memory and time-based prospective memory can make it genuinely hard to stop, switch and leave on time. NICE and NHS guidance both recommend psychoeducation, structured behavioural strategies and external tools such as alarms, calendars and planners to support these skills. By using multiple reminders, consistent routines and clear visual cues, adults with ADHD can reduce lateness, improve daily flow and build greater confidence in managing transitions. 

Harriet Winslow, BSc

Author

Harriet Winslow is a clinical psychologist with a Bachelor’s in Clinical Psychology and extensive experience in behaviour therapy and developmental disorders. She has worked with children and adolescents with ADHD, autism spectrum disorder (ASD), learning disabilities, and behavioural challenges, providing individual and group therapy using evidence-based approaches such as CBT and DBT. Dr. Winslow has developed and implemented personalised treatment plans, conducted formal and informal assessments, and delivered crisis intervention for clients in need of urgent mental health care. Her expertise spans assessment, treatment planning, and behavioural intervention for both neurodevelopmental and mental health conditions.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.