Who better qualified to delve into this topic?

The psychologist who ... helped to bring Killing Eve's assassin to life

Freestone gives us the hit man, the conman, the parasite, and the borderline, among others. Putting these subjects in motion in situations and relationships effectively brings them alive.

Brilliant, compulsively readable ... Pollan's storytelling is deft, forthright and fascinating.

Like it or not, we are undergoing a drugs revolution ... thankfully Pollan is here to guide us through this putative challenge ... [this] relatable, middle class New York plant fancier might be the ideal standard bearer for today's calmer, more scientific approach to the subject.

Pollan's intertwining of reportage, citizen science and historical scholarship is a delightful and informative read ... [he] has a rational optimism that might tempt even the most sober and sceptical to try to broaden their horizons.

Pollan is a gentle, generous writer.

Michael Pollan weaves tales of drug experimentation into a historical account of our long relationship with them.

This Is Your Mind on Plants is witty, entertaining and polite, but it is not trivial. Subtly but assuredly, Pollan argues that which plants (and fungi) we are allowed and how depends, consciously or otherwise, on the interests of power.

The descriptions of London's coffee house culture and Honoré de Balzac's barbarous habit of ingesting dry coffee grounds to fuel all-night scribbling sessions are worth the book's price alone ... The book is really about the relation between each plant and the humans who consume it, tackled in a non-judgmental and objective way that seeks to dispel the ignorance, prejudice and demonisation they attract.

Fascinating and occasionally terrifying ... His opium chapter is mesmerising.

A tour around three substances: caffeine, mescaline and opium. The first is legal, the others remain mostly illegal. Pollan offers us rich historical contexts for them that are often surprising.

Every now and then to be put in touch with what really matters - what could be more important than that?

A small miracle of a book. Reading it feels like its own kind of lucid dream … You would imagine a book written in such circumstances would have a hazy quality, but in fact its clarity of expression is startling. It's a fireworks display. It's also a profound meditation on language and loss and time, and on how we construct ourselves through stories. And it's painful. And it's beautiful. And I love it. Samantha Harvey is the most exceptionally gifted of authors, and here she demonstrates that she can literally do anything.

I am still shuddering, almost, from the beautiful, beautiful writing and its broken, angry, vibrant demand – a dare almost – to accept life, and brave it, with all it brings.

A creative account of a life with little sleep… Readers looking for their own cure will instead find an erudite companion to help them through the dark times.

It's funny, sad, wry, always worrying away at the mystery of sleep and its absence and finding endless new angles so that the whole has something of the quality of those waking dreams that haunt the insomniac and are her private country.

A slim, intense memoir about her own year-long experience of nocturnal unrest… a torture Harvey describes with a combination of desperation, wry humour and — despite the scarcity she is subjected to — a deeply felt sense of life’s abundance… [her] prose…glows off the page: an exacting inquisition of the self leading to imperfect peace.

[Harvey is] brilliant on words and the nature of writing.

[With The Shapeless Unease] Harvey has certainly proved that insomnia, as much as any of the more obviously nasty diseases, might be as worthy a subject of literature as love, battle or jealousy…her book rises to that level.

[A] bravely exposing deep dive into the emotional murk of her [Havey’s] restless mind….[it] reveals…the irresistible writerly impulse to pin experience to the page.

[The Shapeless Unease] reads like a dream sequence… Even reading this made me feel dizzy… [Harvey is] a vigorous, eloquent writer… she conveys the way sleeplessness takes you into the death zone of life.

Mesmerising…at times, bitingly funny… [The Shapeless Unease is] an engrossing portrait of the fragility of identity and coherency in the grip of insomnia. I hadn’t read Harvey before this, but her facility with language here captivated me and I’ll be seeking out her novels next.

Urgent and full of arresting images and insights.

[The Shapeless Unease] is littered with sharp insights expressed in exquisitely lucid prose but is as amorphous as its title suggests.

It’s a claustrophobic, enlightening, moving, existential treatise on sleep, insomnia and death. And it’s funny, too.

I wish I had saved The Shapeless Unease to read in isolation but Samantha Harvey’s book about insomnia, time, death and so many unknowable things is a blessing to have in lonely times. It is a profound and stunning book but funny, too.

A beautiful, jagged little book about insomnia and so many unknowable things: life and death, Buddhism, and how language alters our thinking. But I was most struck by its form and structure.

[Samantha Harvey's] cerebral, startlingly clear account of somehow pulling through [from insomnia] carries an electric charge and meditates on not only the mystery of sleep but also writing, swimming and dreams.

[The Shapeless Unease] is beautifully crafted and its achievement makes itself more apparent on a second reading.

A masterpiece, so good I can hardly breathe. I'm completely floored by it.

This book seems appropriately messy-haired and wild-eyed... Anyone who has lain awake the night before a big test will recognize such manic flourishes. Harvey captures the 4 a.m. bloom of magical thinking; stories proliferate within stories... To read Harvey is to grow spoiled on gorgeous phrases.