The purpose of this study is to evaluate the effect of Foquest® on sleep, using actigraphy and sleep diaries, in children aged 6-12 compared to baseline on no medication. Sleep difficulties, including prolonged sleep onset latency and decreased total sleep time have a significant negative impact on the functioning of children. In adults, sleep deprivation may result in drowsiness and yawning. However, in children, this may manifest as mood and behavioural disturbances which may even mimic the classic symptoms of ADHD; hyperactivity, poor impulse control, and inattention. This can in turn negatively affect the day to day activities of a child such as social interactions and learning. A meta-analysis in 2015 showed that stimulant medications impair sleep of children and adolescents. Some researchers have argued that stimulant medication may improve sleep. Importantly there appears to be heterogeneity in the effects of stimulant medication on sleep with some people sleeping better and some people worse after taking Foquest®. Although the randomized controlled trials done to date have demonstrated the efficacy and outlined the safety profile of Foquest, there remains some unanswered questions about the practical implications in the real-world setting. Some clinicians have raised the concern, for example, that the extended duration of Foquest, may have a negative impact on sleep. This study will evaluate the effect of Foquest® on sleep and particularly sleep latency and self and parent reported sleep restorative quality. This would be a novel study as there is no objective or subjective data on the effect of the Foquest® on sleep latency and total sleep time in children aged 6-12.

Attention Deficit Hyperactivity Disorder (ADHD) is a heterogeneous neurobehavioral disorder characterized by a persistent pattern of developmentally inappropriate inattentiveness, impulsivity, and hyperactivity. It is the most common pediatric neurobiological condition affecting approximately 5-7% of children worldwide.

Sleep difficulties, including prolonged sleep onset latency and decreased total sleep time have a significant negative impact on the functioning of children. This may manifest as mood and behavioural disturbances which may even mimic the classic symptoms of ADHD; hyperactivity, poor impulse control, and inattention. This can in turn negatively affect the day to day activities of a child such as social interactions and learning. A meta-analysis in 2015 showed that stimulant medications impair sleep of children and adolescents. Some researchers have argued that stimulant medication may improve sleep. Importantly there appears to be heterogeneity in the effects of stimulant medication on sleep with some people sleeping better and some people worse after taking Foquest®.

To date, seven pharmacokinetic studies of FOQUEST and six phase 3 clinical trials have been conducted. FOQUEST has demonstrated efficacy in the treatment of ADHD symptoms in double-blind, randomized clinical trials in children (aged 6 to 12), adolescents (aged 12 to 17) and adults (aged 18 or older). However, some clinicians have raised the concern that the extended duration of Foquest, may have a negative impact on sleep.

The purpose of this study is to evaluate the effect of Foquest® on sleep, using actigraphy and sleep diaries, in children aged 6-12 compared to baseline on no medication. This study will particularly evaluate the effect of Foquest® on sleep latency and self and parent reported sleep restorative quality. This would be a novel study as there is no objective or subjective data on the effect of the Foquest® on sleep latency and total sleep time in children aged 6-12.

Inclusion Criteria:

1. Male or female patient aged 6 to 12 years at the time of consent/assent.
2. Subject's parent or legally authorized representative (LAR) must be mentally and physically competent to provide informed consent and subject must be competent to provide assent and be able and willing to comply with the study protocol, including the number of visits and study duration.
3. Patient meets Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-V) criteria for a diagnosis of ADHD combined presentation, inattentive presentation or hyperactive/impulsive presentation based on history.
4. Patient has a blood pressure measurement within 95th percentile for age, sex and height.
5. Patient and parent (LAR) are willing, able and likely to comply with the study procedures and restrictions within the protocol including wearing an actigraphic wrist device.

Exclusion Criteria:

1. Subject has sleep disorder breathing condition or another sleep disorder that may interfere with the interpretation of the study.
2. Subject has any condition that, in the opinion of the investigator, represent an inappropriate risk to the subject or may confound the interpretation of the study including subject being in an agitated state.
3. Subject has a true allergy to methylphenidate, history of serious adverse reactions to methylphenidate or be known to be non-responsive to methylphenidate. Non-response is defined as methylphenidate use at various doses for a phase of at least four weeks at each dose with little or no clinical benefit in the past 10 years.
4. Subject has a known history or presence of structural cardiac abnormalities, cardiovascular or cerebrovascular disease, serious heart rhythm abnormalities, syncope, tachycardia, cardiac conduction problems (such as clinically significant heart block or QT interval prolongation), exercise-related cardiac events including syncope and pre-syncope, clinically significant bradycardia or moderate to severe hypertension.
5. Subject has a history of seizure disorder (other than a single childhood febrile seizure occurring before the age of 3 years).
6. Subject has glaucoma, hyperthyroidism, thyrotoxicosis, advanced arteriosclerosis, or severe renal insufficiency.
7. Females of child-bearing potential (FOCP) who are pregnant, planning on becoming pregnant or breast feeding.
8. Subject is currently, or within the past 14 days, receiving MAO inhibitors.
9. Subject has a primary diagnosis of bipolar disorder, as assessed at visit.