How smartphone and tablet screens impact sleep

Smartphone Screen with Website | scooms

Research has shown that the light from smartphones, tablets and other screens is having a detrimental impact on our sleep because many emit blue light. Here’s why...

 

BLUE LIGHT

Blue light is all around us. One of the biggest producers of blue light is the sun. The blue light from the sun collides with air molecules causing blue light to scatter everywhere.  This is what makes the sky look blue. In its natural form, your body uses blue light from the sun to regulate your natural sleep and wake cycles.  This is known as your circadian rhythm.

 

PINEAL GLAND

Evolutionarily, this made sense. When the sun goes down in the evening, the amount of natural blue light is reduced, signalling to the pineal gland, a pea-size organ in the brain, that it’s time to rest.

 

MELATONIN

It does this by releasing the hormone melatonin before your regular bedtime. Melatonin reduces alertness, preparing us for sleep.

But looking at screens in the evening stops our bodies from producing melatonin at bedtime, breaking our circadian rhythm and natural sleep cycle; and making us less ready for a good night's sleep.

 

IMPACT ON SLEEP

Studies have found that those who read with a tablet at night get a poor quality sleep and feel less alert than those who read their bedtime stories from a paper book.

So get a better night's sleep and switch off any devices at least an hour before bed!

 

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Bedding size guide

DUVET SIZE GUIDE

These are standard UK bedding measurements so if you know your mattress size, you can easily work out which duvet size you need. (Width x length.)

UK sizes Duvet size Mattress size
Single 135 x 200cm (53 x 79") 90 x 190cm
Double 200 x 200cm (79 x 79") 135 x 190cm
King 225 x 220cm (89 x 87") 150 x 200cm
Super king 260 x 220cm (102 x 87") 180 x 200cm 

US/CANADA BEDDING SIZES: Approximate matches to UK sizes are US King/UK Super king, US Queen/UK King,  US Full/UK Double and US Twin/UK Single.

EUROPEAN BEDDING SIZES: Each size - Single, Double, King and Grand king - is a little larger than the UK equivalent.

Measure your mattress to see which size bedding you need: our UK v European v US mattress comparison guide.

 

DUVET TOG RATING GUIDE

Young children can overheat so if they are old enough to use a full size bed, we recommend using a single size 4.5 tog duvet.

 Tog rating Season / heat Feel
2.5 tog High summer / hot sleepers Light thermal insulation
4.5 tog Summer Lower thermal insulation
9 tog Spring & Autumn Cosy medium heat
All season 13.5 tog 4.5 tog + 9 tog Very warm
All season 11.5 tog 2.5 tog + 9 tog Warm
All season 7 tog 2.5 tog + 4.5 tog Lower warmth

 

DUVET FILL WEIGHT GUIDE

Our goose down duvets have high 700 fill power. Fill weight is measured in GSM (grams per square metre). For example view our 9 tog king size goose down duvet for more duvet details.

Fill weight (not total duvet weight)
Single All seasons - 788gsm
9 tog - 486gsm 
4.5 tog - 302gsm 
2.5 tog - 220gsm
Double All seasons - 1168gsm
9 tog - 720gsm
4.5 tog - 448gsm
2.5 tog - 320gsm
King All seasons - 1478gsm
9 tog - 911gsm
4.5 tog - 567gsm
2.5 tog - 400gsm
Super king All seasons - 1671gsm
9 tog - 1030gsm
4.5 tog - 641gsm
2.5 tog - 480gsm

 

PILLOW SIZE GUIDE

Our pillows come in two sizes and provide medium support. (Width x length.)

Standard  50 x 75cm
King 50 x 90cm

 

BED LINEN SIZE GUIDE

Our fitted sheets are deep fit, up to 40cm / 15.7" mattress depth. And our duvet covers fasten with large, easy to use buttons. (Width x length.)

Duvet cover Fitted sheet Flat sheet Pillowcase (pair)
Single 140 x 200cm 90 x 190cm 180 x 275cm
Double 200 x 200cm 135 x 190cm 230 x 275cm 50 x 75cm (Standard)
King 230 x 220cm 150 x 200cm 275 x 275cm 50 x 90cm (King)
Super king 260 x 220cm 180 x 200cm 305 x 275cm

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